JP2008058045A - Sample collection device for soil pollution investigation, and soil pollution investigation device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sample collection device for soil pollution investigation, which investigates accurately soil pollution, and also to provide a soil pollution investigation device using it. <P>SOLUTION: Water is sucked through a water suction pipe disposed inside a hole in the ground. A lead-in pipe 86a is provided by being branched from the first connection pipe 44 linked to the water suction pipe, and the lead-in pipe 86a is communicated with a water lead-in container 85. An on-off valve 91 is disposed on the first connection pipe 44. Water introduced into the water lead-in container 85 is discharged through a lead-out pipe 86b. A lead-in control valve 87 is disposed in the lead-in pipe 86a and a lead-out control valve 88 is disposed in the lead-out pipe 86b. When both control valves 87, 88 are closed, the lead-in pipe 86a, the water lead-in container 85 and the lead-out pipe 86b positioned between both control valves 87, 88 are sealed by both control valves 87, 88. An investigation object material dissolved in water in the water lead-in container 85 is vaporized in a vaporization container 92 by supplying the air by an air supply pump 102, and the concentration of the investigation object material is measured by a concentration measuring device 104. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a soil contamination survey device for investigating pollutants made of volatile organic compounds (hereinafter referred to as “VOCs”) such as trichlorethylene and tetrachloroethylene existing in the ground.

In the conventional soil contamination investigation device disclosed in Patent Document 1, first, the excavator excavates the ground to a predetermined depth by applying rotational force and striking force to the excavation bit for investigation of surface contamination. Next, after removing the drill bit for surface contamination investigation from the drill head of the excavator, the detection pipe of the underground air sampling pipe is inserted into the body of the drill bit for surface pollution investigation. After that, the vacuum metering pump of the gas sampling set is operated to collect a predetermined underground air through the detection tube, and analyze and measure the polluted gas and the like.
Japanese Patent Laid-Open No. 2003-82976

  However, the conventional soil contamination survey device collects air from the excavation bit for surface contamination investigation that has penetrated into the ground of the excavated ground, so that during the work, surface contamination that has penetrated into the ground. The problem is that ground air intrudes from the gap formed between the excavation bit for investigation and the ground around it and the air is also collected, resulting in poor accuracy of soil contamination investigation and accurate investigation. was there.

  In addition, there is ground where groundwater flows in the ground, and in such places there may be only water at the point where the drilling bit for surface contamination investigation penetrates to collect air. In some cases, air could not be collected, so there was a problem that the survey itself could not be performed.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a soil contamination investigation sample collection device and a soil contamination investigation device using the same that can accurately investigate the soil contamination. And

  In order to achieve this object, a soil contamination investigation sample collecting device according to the present invention includes a water absorption passage having a tip side disposed in a hole drilled in the ground, and a water absorption portion that sucks water through the water absorption passage. Means, an introduction passage branched from a middle portion of the water absorption passage and communicating with the water introduction chamber, water introduction means for introducing water flowing through the water absorption passage into the water introduction chamber, and communication with the water introduction chamber And a discharge passage for discharging water introduced into the water introduction chamber through the introduction passage to the outside of the water introduction chamber and the introduction passage, and allows or prohibits passage of water through the introduction passage. A sampling device for soil contamination investigation, comprising an introduction control valve and a derivation control valve arranged in the derivation passage and allowing or prohibiting passage of water in the derivation passage, The introduction control valve is prohibited, and When the derivation control valve prohibits the passage of water through the derivation passage, the introduction passage, the water introduction chamber, and the derivation passage, which are located between the introduction control valve and the derivation control valve, as viewed from the water flow path, Is sealed by the introduction control valve and the derivation control valve.

  According to a second aspect of the present invention, there is provided a soil contamination investigation sampling device according to the first aspect, wherein the lead-out passage is joined to the water absorption passage and introduced into the water introduction chamber. The water introduced is returned to the water absorption passage again through the outlet passage, and the water introduction means is disposed between the portion where the introduction passage branches from the water absorption passage and the portion where the outlet passage merges with the water absorption passage. The on-off valve is arranged at the water absorption passage and permits or restricts the passage of water flowing through the water absorption passage. In this case, the on-off valve does not only indicate a valve that is completely closed when the valve is closed, but also includes a valve that narrows the flow passage area of the water absorption passage.

  According to a third aspect of the present invention, there is provided a soil contamination investigation sampling device according to the first aspect, wherein the water introduction means is connected to the outlet passage, and the outlet passage is The auxiliary water absorption means for sucking flowing water is used.

  According to a fourth aspect of the present invention, there is provided a soil contamination investigation sample collecting device according to any one of the first to third aspects, wherein the tip side of the water absorption passage is disposed on the ground surface. A plurality of holes formed in the branch water absorption passages, each of which is provided with a branch water absorption passage, the branch passages branching from the branch water absorption passage, and the branch introduction passages. And a collecting introduction passage that is joined and communicated with the water introduction chamber, and the introduction control valve is arranged in each of the branch introduction passages.

  According to a fifth aspect of the present invention, there is provided a soil contamination investigation device according to any one of the first to fourth aspects, wherein the soil contamination investigation sample collection device according to any one of claims 1 to 4 and water stored in the water introduction chamber are used. Vaporization means for vaporizing the dissolved investigation target substance, and measurement means for measuring the concentration of the investigation target substance vaporized by the vaporization means are provided.

  The soil contamination investigation apparatus according to the invention described in claim 6 is the soil contamination investigation apparatus according to claim 5, wherein the vaporization means includes a vaporization chamber and an air supply means for supplying air to the vaporization chamber. The substance stored in the water transferred to the vaporization chamber is vaporized by transferring the water stored in the water introduction chamber to the vaporization chamber and supplying air to the vaporization chamber by the air supply means. The mixture is vaporized in a chamber and mixed with the air in the vaporization chamber to generate mixed air, and the concentration of the investigation target substance contained in the mixed air is measured by the measuring means.

  The soil contamination investigation device according to the invention described in claim 7 is the soil contamination investigation device according to claim 6, wherein one end of an air circulation passage is communicated with an upper portion of the vaporization chamber and the air is disposed under the vaporization chamber. The other end of the circulation passage is communicated, the air supply means is disposed in the middle of the air circulation passage, and the air accumulated in the upper part of the vaporization chamber is sucked from the one end of the air circulation passage by the air supply means. By supplying this sucked air from the other end of the air circulation passage to the water stored in the lower part of the vaporization chamber, the investigation target substance contained in the water transferred to the vaporization chamber is vaporized in the vaporization chamber. The mixed air is generated by mixing with the air in the vaporizing chamber, and the concentration of the investigation target substance contained in the mixed air is measured by the measuring means.

  The soil contamination investigation device according to the invention described in claim 8 is the soil contamination investigation device according to claim 6 or 7, wherein one end and the other end of the measurement circulation passage are communicated with the upper part of the vaporization chamber. In addition, the measurement means is disposed in the middle of the measurement circulation passage, and the mixed air is circulated through the measurement circulation passage and allowed to pass through the measurement means while being circulated through the measurement circulation passage. The concentration of the investigation target substance contained in is measured by the measuring means.

  The soil contamination investigation device according to the invention described in claim 9 is the soil contamination investigation device according to any one of claims 6 to 8, wherein the water in the water introduction chamber is transferred to the vaporization chamber. A water supply means, and a control device that controls the operation of each of the water supply means, the introduction control valve, the derivation control valve, and the air supply means and that outputs a data signal of a measurement value measured by the measurement means. It is what.

According to the present invention, since the introduction passage, the water introduction chamber, and the outlet passage located between the pair of control valves are sealed by the pair of control valves, the water in which the investigation target substance is dissolved is exposed to the air. And can be collected in a sealed state. For this reason, measurement accuracy improves by measuring the density | concentration of the investigation object substance contained in the extract | collected water, and can investigate a soil contamination correctly.
In addition, the introduction passage, the water introduction chamber, and the discharge passage located between the pair of control valves are sealed with the pair of control valves, so that the water in which the investigation target substance is dissolved is sealed without being exposed to the air. The structure for sampling in a state can be simplified and can be provided at low cost.

  According to the second aspect of the present invention, the water introduction means is configured by an on-off valve disposed at a portion of the water absorption passage between a portion where the introduction passage branches from the water absorption passage and a portion where the outlet passage merges with the water absorption passage. Therefore, by simply closing the on-off valve, water can be introduced into the water introduction chamber, and the structure for introducing water into the water introduction chamber can be simplified.

  According to the third aspect of the present invention, the water introducing means is constituted by the auxiliary water absorbing means for sucking the water flowing through the outlet passage, so that the water can be quickly introduced into the water introducing chamber.

  According to the fourth aspect of the present invention, the tip side of the water absorption passage is constituted by the branch water absorption passages each having the tip side disposed in the plurality of holes bored in the ground, while the introduction passage is constituted by the branch water absorption. Since the branch introduction passages branched from the passages and the branch introduction passages merged to communicate with the water introduction chamber, the introduction control valves are arranged in the branch introduction passages. Opening the introduction control valves one by one and closing the remaining introduction control valves makes it easy to individually collect the underground water at each point where the branch water intake passages are arranged. . For this reason, by individually measuring the concentration of the substance to be investigated contained in the water collected individually, it is possible to easily conduct an investigation of soil contamination at each point where the branch water absorption passages are arranged.

  According to the invention described in claim 5, since the investigation target substance dissolved in the water collected by the soil contamination investigation sampling device is vaporized, and the concentration of the vaporized investigation target substance is measured, The measurement accuracy of the concentration of the investigation target substance is improved, and the soil contamination can be accurately investigated.

  According to the sixth aspect of the invention, by supplying air to the vaporizing chamber by the air supply means, the investigation target substance contained in the water transferred to the vaporizing chamber is vaporized in the vaporizing chamber and mixed with the air in the vaporizing chamber. The mixed air is generated and the concentration of the investigation target substance contained in this mixed air is measured by the measuring means, so that the air can be sufficiently brought into contact with the water in which the investigation target substance is dissolved, and dissolved in the water. The target substance can be reliably vaporized. For this reason, the measurement accuracy of the concentration of the investigation target substance is improved, and the soil contamination can be accurately investigated.

  According to the seventh aspect of the present invention, the air accumulated in the upper part of the vaporization chamber is sucked by the air supply means from one end of the air circulation passage, and the sucked air is again returned from the other end of the air circulation passage to the lower portion of the vaporization chamber. By supplying it to the stored water, the investigation target substance contained in the water transferred to the vaporization chamber is vaporized in the vaporization chamber and mixed with the air in the vaporization chamber to generate mixed air, and the investigation target contained in this mixed air Since the concentration of the substance is measured by the measuring means, the investigation target substance dissolved in water can be vaporized by bringing only the air accumulated in the upper part of the vaporization chamber into contact with the water in which the investigation target substance is dissolved. . For this reason, the amount of air used for vaporization of the investigation target substance can be reduced as much as possible, and the content ratio of the investigation target substance to the air can be reduced. Contamination can be accurately investigated.

  According to the eighth aspect of the present invention, the concentration of the investigation target substance contained in the mixed air is measured while circulating the mixed air accumulated in the upper part of the vaporization chamber through the measurement circulation passage and passing through the measurement means. Therefore, it is possible to measure the concentration while keeping the content ratio of the investigation target substance to the air constant. For this reason, since the concentration is less likely to change during the measurement of the concentration of the investigation target substance, the measurement accuracy can be improved and the soil contamination can be accurately investigated.

  According to the ninth aspect of the invention, the control device performs the operation control of each of the water supply means, the introduction control valve, the derivation control valve, and the air supply means and the output of the data signal of the measured value measured by the measurement means. As a result, the concentration of the investigation target substance is automatically measured, and labor saving of the soil contamination investigation work can be achieved.

(First embodiment)
Hereinafter, a first embodiment of a soil contamination investigation device according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a side view showing a configuration of a work vehicle equipped with a soil contamination investigation device according to the present invention, and FIG. 2 is a plan view showing a state where the work vehicle equipped with the soil contamination investigation device according to the present invention is viewed from above. is there. 3 is a cross-sectional view showing a state in which the excavation member is fixed to the tip of the borehole, and FIGS. 4A and 4B are enlarged cross-sectional views showing a state in which the excavation member is crossed. (C) is an enlarged view showing the appearance of the excavation member viewed from the tip side. FIG. 5 is a block diagram showing the configuration of the soil contamination survey device according to the present invention, FIG. 6 is a block diagram showing the configuration of the soil contamination survey device body, and FIG. 7 is fixed to the rear end of the borehole. FIG. 8 is a diagram illustrating a configuration of a blocking member, and FIG. 8 is a diagram illustrating a configuration of a three-way joint connected to a water supply pipe and a water absorption pipe. FIG. 9 is a cross-sectional view showing the configuration of the cleaning liquid discharge hole formed in the borehole, and FIG. 10 shows the appearance of the frame on which the water supply pipe, the water suction pipe and the borehole are mounted as seen from the front. FIG. 11 is a diagram showing the appearance of the frame viewed from the left side. 1, 2, 5, and 6 are illustrated with the ratios of the scales of the constituent members being different from each other for convenience of drawing.

  In FIG. 1 and FIG. 2, what is shown with the code | symbol 1 shows the work vehicle equipped with the borehole apparatus 2 by this embodiment. FIG. 2 is a plan view showing the work vehicle 1 before mounting the test tube 24 described later. The work vehicle 1 includes a pair of left and right endless track bands 3 and 3, an engine 4 that drives the endless track bands 3 and 3 (FIG. 1 shows only the left side), and excavation. The drilling mechanism 5 for drilling holes in the ground, a water supply pump 6, a vacuum pump 7, a first water storage container 8a, a second water storage container 8b, and the like are provided. The borehole device 2 is constituted by the borehole mechanism unit 5, the water supply pump 6, the control panel 25 described later, and the like. The borehole device 2, the vacuum pump 7, the first water storage container 8a, and the second water storage container 8b are installed and fixed on a base 11 provided in the work vehicle 1.

  The endless track bands 3 and 3 are wound around the drive sprocket 12 and the driven sprockets 13... And the engine 4 is disposed between the pair of left and right endless track bands 3 and 3 in the rear portion of the work vehicle 1. An operation panel 14 is disposed at the rear of the work vehicle 1, and the first operation element 14 a disposed on the operation panel 14 is operated to drive the driving force of the engine 4 to the drive sprocket 12. Alternatively, the work vehicle 1 is caused to travel or stop by being transmitted or interrupted so as to travel in the reverse direction. Further, the traveling direction of the work vehicle 1 is changed by operating the second operation element 14b disposed on the operation panel 14 to change the rotational speeds of the pair of left and right endless track zones 3 and 3 respectively.

  A base body 15 is provided above the pair of left and right endless track bands 3 and 3 and in front of the operation panel 14, and the base 11 is supported by the base body 15 so as to be movable up and down. The base 11 is connected to the base body 15 by a link member 16, and a hydraulic cylinder 17 a is installed between the base 11 and the base body 15. The hydraulic cylinder 17a is telescopically driven by a hydraulic pump 17b disposed on the right side surface of the engine 4 by operating a third operating element 14c provided on the operation panel 14, and the hydraulic cylinder 17a is fixed at an arbitrary expansion / contraction position. It is configured to be able to.

  Accordingly, the base 11 is supported at an arbitrary position in the vertical direction with respect to the base body 15. When the pedestal 11 is displaced downward in the vertical direction with respect to the base body 15, accordingly, the circular rotating body 21 pivotally supported by the support member 11 a erected on the pedestal 11 is connected to the base body 15. The rotation angle of the rotating body 21 is measured by the encoder 22 fixed to the support member 11a. The signal of the measurement value is transmitted to the controller 23 in the control panel 25 mounted on the base 11 via an electric wire, and is stored as measurement value data in a memory 23a provided in the controller 23 (see FIG. 5). reference). The controller 23 constitutes a control device according to the present invention, and controls the operation of the borehole device 2, the vacuum pump 7, a soil contamination investigation device main body 9 and a pressurizing pump 52 described later.

  Further, as shown in FIG. 1, the pedestal 11 is configured to be displaced by a stroke S between the highest position and the lowest position, and the number of times the pedestal 11 is lowered from the highest position to the lowest position is measured by a counter (not shown). Stored in the memory 23a. Based on this number of times and the rotation angle measured by the encoder 22, the depth at which the cylindrical test tube 24 for drilling a hole in the ground E penetrates into the ground is calculated by a calculation means provided in the controller 23. Desired. When the pedestal 11 is lowered to the lowest position, an indicator lamp (not shown) for notifying the operator of the fact is turned on.

  In addition, a timer 23b is disposed in the controller 23, and the time after the start of excavation by the borehole mechanism unit 5 is measured by the timer 23b. Then, the measurement time by the timer 23b, the depth data measured by the encoder 22, and the measurement data measured by the concentration measuring device 104 described later are associated with each other by the control circuit in the controller 23 and output to the memory 23a. As a result, the concentration of VOCs for each depth in the ground is stored in the memory 23a in association with the passage of time.

  When the pedestal 11 is displaced vertically downward and the rotator 21 rotates clockwise, a torsion spring (not shown) laid between the rotator 21 and the support member 11a side is bent to cause the rotator 21 to move. Torque to rotate counterclockwise acts, and this torsion spring acts to rotate the rotating body 21 counterclockwise when the pedestal 11 is displaced vertically upward.

  The borehole mechanism 5 is fixed to the front portion of the base 11 and reciprocally rotates the borehole 24 around its axis L1 at a predetermined rotation angle (a rotation angle of forward and reverse 300 degrees) while holding the borehole 24. A clamp 5a, and a borehole rotation motor 5b for transmitting rotational force to the clamp 5a. The rotational speed of the borehole 24 can be adjusted steplessly by operating an operation switch 25a provided on a control panel 25 mounted on the pedestal 11. In addition, during the excavation work, if there are obstacles such as stones in the ground, the time for excavation work may be increased by that amount because the obstacles are crushed and removed. In this case, the operation switch 25b provided on the control panel 25 is operated and the fact is stored in the memory 23a, and there is a relationship between the time zone when the obstacle removal work occurs and the depth and concentration measurement data at that time. It will be understood later when organizing the measurement data.

  As shown in FIG. 9, the test tube 24 is divided into a plurality of cylindrical divided tubes 73 having an outer diameter of 27.2 millimeters, an inner diameter of 23.4 millimeters, and a length of 2 meters, and divided tubes 73. It is comprised by the cylindrical trial pipe joint 76 ... screwed together, and the division pipe 73 ... and the trial pipe joint 76 ... consist of stainless steel members. The male threaded portion engraved on the outer peripheral surface of each end portion of the split tube 73 is screwed into the female thread portion engraved on the inner peripheral surface of each end portion of the trial tube joint 76. By connecting the borehole joints 76 one after another, one long borehole 24 is formed. The threaded portions of the divided pipes 73 and the trial pipe joints 76 have a taper screw structure, and are not loosened by being firmly screwed together.

  As shown in FIG. 3, a substantially cylindrical excavation member 26 for excavating the underground is screwed into a borehole joint 76 that constitutes the tip of the borehole 24, and a hard hole is placed in the borehole 24. A water absorption pipe 27 made of nylon resin is inserted, and water is supplied into the water absorption pipe 27 by the water supply pump 6 (registered trademark, which is PTFE (polytetrafluoroethylene), the same applies hereinafter) made of resin. The water supply pipe 28 is inserted. Both the water absorption pipe 27 and the water supply pipe 28 have a circular cross section. Further, the gap between the outer periphery of the water supply pipe 28 and the inner periphery of the water absorption pipe 27 constitutes a water absorption passage in the present invention.

  The excavation member 26 is screwed to the excavation part 26 a at the tip, a cylindrical excavation member main body 26 b to which the excavation part 26 a is screwed, and a borehole joint 76 constituting the tip of the borehole 24. The water recovery part 32 which consists of a connection member 37 and has a substantially cylindrical cavity is provided inside the excavation member main body 26b. The axis L2 of the excavation member 26 (the axis L1 of the borehole 24 to which the excavation member 26 is fixed). The water supply hole 33 is drilled in the direction of the axis L2 in the excavation part 26a, and the water supply hole 33 is connected to the excavation part 26a via a first communication path 34. To communicate with the water supply pipe 28.

  A male threaded portion engraved on the outer peripheral surface of one end of the tubular water pipe coupling member 35 is screwed into a female threaded portion engraved at the end of the first communication passage 34 opposite to the water supply hole 33. The distal end portion 28a of the water supply pipe 28 is fitted to the other end of the water supply pipe joint member 35 and is firmly held by a clamp member (not shown). For this reason, the water supply pipe 28 can be separated from the excavation member 26 in the axial direction of the water supply pipe 28 by loosening the male thread portion of the water supply pipe joint member 35 while the water supply pipe 28 is fitted.

  A branch passage 34 b is branched from a middle portion of the first communication passage 34, and a terminal end of the branch passage 34 b opens to the bottom 32 a of the water recovery portion 32 to form a water injection hole 36. As shown in FIG. 4A, which is an enlarged cross-sectional view taken along the line AA in FIG. 3, the water injection hole 36 is axially displaced at a portion biased in the radial direction from the axis L2 of the excavating member 26. It is perforated with a predetermined angle (appropriately set in the range of 5 to 15 degrees) in the circumferential direction around the core L2.

  The connecting member 37 is formed of a tubular member in which a middle portion in the longitudinal direction has a large diameter and a male screw portion is engraved at both ends having a smaller diameter, and one of the male screw portions is an excavation portion. A second communication passage 37 a communicating with the water recovery portion 32 is formed in the connection member 37 by being screwed into a female screw portion carved on the inner peripheral surface of the end portion of the excavation member main body 26 b opposite to the excavation member 26. Are formed along the axis L2. A female threaded portion is formed on the inner peripheral surface of the end of the second communication passage 37a opposite to the water recovery portion 32, and this female threaded portion is etched on the outer peripheral surface of one end of the tubular water-absorbing pipe joint member 38. The provided male screw portion is screwed together, and the distal end portion 27a of the water absorption tube 27 is fitted into the small diameter portion of the other end portion of the water absorption tube joint member 38, and is firmly held by a clamp member (not shown). The For this reason, the water absorption pipe 27 can be separated from the excavation member 26 in the axial direction of the water absorption pipe 27 by loosening the male thread portion of the water absorption pipe joint member 38 with the water absorption pipe 27 fitted. The water collection part 32 in the excavation member main body 26b, the second communication passage 37a of the connecting member 37, and the inside of the water absorption pipe joint member 38 constitute the water absorption passage referred to in the present invention. Thus, the water supply pipe 28 is disposed through the center of the water recovery unit 32. Note that each of the threaded portions of the borehole joint 76 and the connecting member 37, the connecting member 37 and the excavating member main body 26b, and the excavating member main body 26b and the excavating portion 26a has a taper screw structure, and is not loosened by being firmly screwed together. ing.

  Further, as shown in FIG. 4 (b) shown as an enlarged cross-sectional view along the line BB in FIG. 3 and FIG. 3, the excavation member body 26b of the excavation member 26 is connected to the outside of the excavation member 26. Water recovery holes 32b communicating with the water recovery part 32 are formed in a long hole shape extending in parallel to the axis L2 of the excavating member 26, and these water recovery holes 32b are formed at equal angular intervals around the axis L2. Individually formed. Since the water recovery holes 32b are formed in a long hole shape, a sufficient opening area of the water recovery holes 32b can be secured, and a large grain soil cannot pass through the water recovery holes 32b, so that only fine soil is obtained. Is recovered as muddy water. The outer periphery of the water recovery holes 32b is chamfered so as to facilitate the passage of muddy water (see FIG. 3). Thus, the water injection hole 36 is positioned on the upstream side of the water recovery holes 32b as viewed from the path of the water flowing through the water recovery part 32 constituting the water absorption path and the second communication path 37a of the connecting member 37, A part of the water flowing through the water supply passage in the water supply pipe 28 is injected from the water injection hole 36 so as to substantially follow the water flow direction of the water recovery unit 32.

  The excavation part 26a of the excavation member 26 includes an excavation part main body 41, and excavation rods 42 are screwed into the excavation part main body 41 in parallel with the axis L2 of the excavation member 26. As shown in FIG. 4 (c), which shows an enlarged appearance of the excavation member 26 as viewed from the tip side, the excavation rods 42 are formed so as to surround the periphery of the shaft core L2 of the excavation member 26. An excavation rod 42 is implanted in a cylindrical protrusion 41a of the excavation part main body 41, and six excavation rods 42 are formed around the cylindrical protrusion 41a so as to surround the three excavation rods 42. It is planted in the part 41b. The excavation part 26a is heat-treated and hardened in a state where a total of nine excavation rods 42 are screwed together, and then the tips of the excavation rods 42 are polished by a polishing machine and formed into a shape suitable for excavation. ing.

  As shown in FIG. 1, a water mud separation container 43 is fixed to the support member 11a of the pedestal 11 via a pair of holding members 43a. As shown in FIG. 3 connecting pipes 71 are connected, and the upper part of the water mud separation container 43 and the respective bottom parts of the first water storage container 8a and the second water storage container 8b constitute the first connection pipe 44 constituting the downstream part of the water absorption passage in the present invention. Connected through. Accordingly, the water mud separation container 43 is disposed on the upstream side of the water storage containers 8a and 8b when viewed from the path of the water flowing through the water absorption passage. A rubber plug member 45 to be removed when the mud in the water mud separation container 43 is discharged is detachably fitted to the bottom of the water mud separation container 43. The water mud separation container 43 is a substantially cylindrical transparent container for separating water and mud, and the capacity of the water mud separation container 43 is the ground at one point that is the subject of soil contamination investigation. The capacity is slightly larger than the volume corresponding to the volume of mud that is discharged to the ground when excavating to a predetermined depth. A scale is attached to the outer surface of the water mud separation container 43 for each position corresponding to the amount of mud for a depth of 1 meter, and the approximate depth during the drilling operation is determined from the relationship between this scale and the amount of mud stored. I can grasp it.

  In the middle of the first connecting pipe 44, a first electromagnetic valve 46a that opens and closes a passage between the water mud separation container 43 and the first water storage container 8a, and between the water mud separation container 43 and the second water storage container 8b. A second electromagnetic valve 46b that opens and closes the passage is disposed. The upper part of the water mud separation container 43 and the water storage containers 8a and 8b are connected via the first connection pipe 44, and mud cannot be removed by the water mud separation container 43 in the middle of the first connection pipe 44. In consideration of the case, a mud filter 72 is provided as a precaution.

  Further, in the middle of the first drain pipe 47a provided by branching from the middle part of the first connection pipe 44 between the first water storage container 8a and the first electromagnetic valve 46a, the first water storage container 8a is provided. A third solenoid valve 46c is provided that opens when the stored water is discharged. On the other hand, the second drainage pipe 47b provided by branching from the middle part of the first connection pipe 44 between the second water storage container 8b and the second electromagnetic valve 46b is stored in the second water storage container 8b. A fourth solenoid valve 46d is provided that opens when draining the discharged water.

  The first water storage container 8a and the second water storage container 8b detect that the water level of the stored water has reached either the preset maximum water level or the minimum water level, and send the detection signal to the controller 23. A first water level detection sensor 48a and a second water level detection sensor 48b that transmit via electric wires (not shown) are respectively provided. A pressure pump 52 mounted on the pedestal 11 is connected to the upper part of each of the water storage containers 8a and 8b via the second connection pipe 51, and the water stored in the water storage containers 8a and 8b is drained from the drain pipe 47a, The water storage containers 8a and 8b are pressurized by the pressurizing pump 52 when discharged through 47b. In the middle of the second connecting pipe 51, a fifth electromagnetic valve 46e for opening and closing a passage between the pressurizing pump 52 and the first water storage container 8a, and between the pressurizing pump 52 and the second water storage container 8b. A sixth electromagnetic valve 46f that opens and closes the passage is disposed.

One end of an exhaust pipe 53 from which the gas sucked out from the water storage containers 8 a and 8 b is discharged is connected to the middle part of the second connection pipe 51, and the vacuum pump 7 is connected to the middle part of the exhaust pipe 53. The pressure in the water storage containers 8 a and 8 b is reduced by the vacuum pump 7. Further, in the middle of the second connecting pipe 51, a seventh electromagnetic valve 46g for opening and closing a passage between the vacuum pump 7 and the first water storage container 8a, and between the vacuum pump 7 and the second water storage container 8b are provided. An eighth electromagnetic valve 46h that opens and closes the passage is provided. Vacuum pump 7, first water storage container 8a, second water storage container 8b, first electromagnetic valve 46a, second electromagnetic valve 46b, third electromagnetic valve 46c, fourth electromagnetic valve 46d, fifth electromagnetic valve 46e, sixth electromagnetic valve 46f, the seventh electromagnetic valve 46g, the eighth electromagnetic valve 46h, and the pressurizing pump 52 constitute the water absorption means 50.
The first electromagnetic valve 46 a to the eighth electromagnetic valve 46 h described above are connected to the controller 23 via electric wires (not shown), and are controlled to be opened and closed by the controller 23. The water supply pump 6, the vacuum pump 7 and the pressure pump 52 are also connected to the controller 23 via electric wires (not shown), and the controller 23 controls the operation or stop of the operation.

  As shown in FIG. 5, the soil contamination investigation device main body 9 is disposed between the mud filter 72 and the first electromagnetic valve 46 a and the second electromagnetic valve 46 b in the first connection pipe 44. The soil contamination investigation device main body 9 is disposed on the pedestal 11 except for a washing water tank 115 described later. As shown in FIG. 6, the soil contamination investigation device main body 9 includes an introduction pipe 86 a branched from the first connection pipe 44 and connected to one end of a cylindrical water introduction container 85, and the other end of the water introduction container 85. A lead-out pipe 86b that is connected to the pipe and piped so that the water introduced into the water introduction container 85 joins the first connection pipe 44 again, and an introduction control valve 87 disposed in the middle of the introduction pipe 86a, From the solenoid valve disposed between the derivation control valve 88 disposed in the middle part of the derivation pipe 86b, and the junction part of the first connection pipe 44 with the introduction pipe 86a and the derivation pipe 86b. And an on-off valve 91. The inside of the introduction pipe 86a constitutes the introduction passage of the present invention, the inside of the lead-out pipe 86b constitutes the lead-out passage of the present invention, and the inside of the water introduction container 85 constitutes the water introduction chamber referred to in the present invention.

  One end of the fourth connection pipe 93 is connected to one end of the water introduction container 85, and the other end of the fourth connection pipe 93 communicates with the upper part in the cylindrical vaporization container 92. The water stored in the water introduction container 85 is introduced into the vaporization container 92 through the fourth connection pipe 93. A water supply pump 96 for forcibly supplying water in the water introduction container 85 to the vaporization container 92 is disposed in the middle of the fourth connection pipe 93, and the water introduction container 85 and the water supply in the fourth connection pipe 93 are arranged. Between the pump 96, a ninth electromagnetic valve 93a is disposed. A first air introduction pipe 94 for introducing air is connected to the other end portion of the water introduction container 85, and a tenth electromagnetic valve 94a is disposed in the middle portion thereof. The ninth electromagnetic valve 93a, the tenth electromagnetic valve 94a and the water supply pump 96 constitute the water supply means referred to in the present invention. Note that the water in the water introduction container 85 can be supplied to the vaporization container 92 by free fall only by opening both the ninth electromagnetic valve 93a and the tenth electromagnetic valve 94a without providing the water pump 96. In that case, the time required for water supply becomes longer than that of forced water supply by the water pump 96.

  The inside of the vaporization container 92 constitutes a vaporization chamber as referred to in the present invention, and the downstream end of the fourth connection pipe 93 is communicated with the upper center in the vaporization container 92, and the water flowing out from the fourth connection pipe 93 falls. It is positioned as follows. The water that has fallen into the vaporization container 92 is stored in the lower part of the vaporization container 92. Both ends of the air circulation pipe 101 are communicated with the upper part and the lower part in the vaporization container 92, respectively, and the air in the upper part in the vaporization container 92 is converted into air by an air supply pump 102 disposed in the middle of the air circulation pipe 101. The gas is discharged from one end of the circulation pipe 101 and is again introduced from the other end at the lower part in the vaporization container 92 to circulate. The inside of the air circulation pipe 101 constitutes an air circulation passage referred to in the present invention, and the air supply pump 102 constitutes an air supply means referred to in the present invention.

  One end of the circulation circulation pipe 103 for measurement is communicated with the upper part of the vaporization container 92, and the other end of the circulation circulation pipe 103 for measurement is connected to the concentration measuring device 104 constituting the measurement means referred to in the present invention. Yes. The concentration measuring device 104 is connected to the controller 23 via an electric wire (not shown). A first three-way solenoid valve 103a is disposed in the middle of the measurement circulation forward pipe 103, and a ventilation pipe 108 is provided in the first three-way solenoid valve 103a, and a dehumidifying part is provided in the middle of the ventilation pipe 108. A filter 112 is provided. Further, one end of a measurement circulation return pipe 109 is connected to the concentration measuring device 104, and the other end of the measurement circulation return pipe 109 communicates with an upper portion in the vaporization container 92. The inside of each of the measurement circulation outward pipe 103 and the measurement circulation return pipe 109 constitutes a measurement circulation passage in the present invention. In addition, a second three-way solenoid valve 109a is disposed in the middle of the measurement circulation return pipe 109, and an exhaust pipe 116 is connected to the second three-way solenoid valve 109a, which is introduced via the ventilation pipe 108 and the concentration. The air after the inside of the measuring device 104 is cleaned is discharged from the exhaust pipe 116. A second air introduction pipe 110 for introducing air into the upper part of the vaporization container 92 is piped on the upper part of the vaporization container 92, and an eleventh electromagnetic valve 110a is provided in the middle of the second air introduction pipe 110. Is arranged.

  On the other hand, a third drain pipe 98 for discharging water in the vaporizer container 92 is piped at the bottom of the vaporizer container 92, and a drainage pump 106 is arranged in the middle of the third drain pipe 98. A twelfth electromagnetic valve 98 a is disposed between the vaporization container 92 and the drainage pump 106. It should be noted that the water in the vaporization vessel 92 can be discharged by free fall by simply opening both the eleventh electromagnetic valve 110a and the twelfth electromagnetic valve 98a without providing the drain pump 106. In that case, the time required for drainage becomes longer than the forced drainage by the drainage pump 106.

  The introduction control valve 87, the derivation control valve 88, the on-off valve 91, the ninth electromagnetic valve 93a, the tenth electromagnetic valve 94a, the eleventh electromagnetic valve 110a, the twelfth electromagnetic valve 98a, the first three-way electromagnetic valve 103a and the second three-way. The solenoid valve 109a is composed of a solenoid valve, and is connected to the controller 23 via an electric wire (not shown), and is controlled to be opened and closed by the controller 23. Instead of the introduction control valve 87 and the on-off valve 91, a single three-way solenoid valve is disposed at the branch portion of the first connection pipe 44 with the introduction pipe 86a, and the first connection pipe 44 and the introduction pipe 86a are connected. The flow of flowing water may be controlled by the controller 23. In this case, the one three-way solenoid valve has both functions of the introduction control valve 87 and the on-off valve 91.

  In the middle of the fourth connecting pipe 93 between the water pump 96 and the vaporization vessel 92, the water for the washing stored in the washing water tank 115 is supplied to the vaporization vessel 92 in order to wash the vaporization vessel 92. A water pipe 117 is connected, and a cleaning water supply pump 122 is disposed in the middle of the cleaning water pipe 117, and the water in the cleaning water tank 115 is forced by the pump 122 through the cleaning water pipe 117. 85. The water pump 96, the air supply pump 102, the drainage pump 106, and the cleaning water supply pump 122 are connected to the controller 23 via electric wires (not shown), and are controlled by the controller 23 or controlled by the controller 23. Is done. The cleaning water tank 115 is installed on the ground E near the work vehicle 1.

  As shown in FIG. 7, a blocking member 55 made of an aluminum alloy is attached to the trial tube joint 76 constituting the rear end portion of the trial tube 24. That is, the opening between the water intake pipe 27 and the water supply pipe 28 protruding from the borehole joint 76 and the water absorption pipe 27 is closed by the closing member 55, and the closing member 55 forms the rear end portion of the borehole 24. When mounted on the pipe joint 76, the hinge portion is formed of a pair of half bodies 55a and 55b whose joint plane is a virtual plane passing through the axis L1 of the borehole 24, and is integrally formed with each of the half bodies 55a and 55b. A pin 57 is inserted into the hinge hole 56, and the halves 55a and 55b are joined or detached by rotating the halves 55a and 55b toward and away from each other around the axis L3 of the pin 57. The

Concave recesses 58a and 58b are formed on the opposite sides of the half portions 55a and 55b from the hinge portion 56, respectively, and one end portion of a rod-like locking member 61 is rotatably supported in the recess portion 58b of the half body 55b. Yes. In a state where the halves 55a and 55b are joined to each other, the screw member 61a inserted into the recess 58a of the half 55a and screwed to the other end of the lock member 61 is used as the end surface of the half 55a. The half bodies 55a and 55b are firmly joined to each other by being screwed so as to be pressed against each other.
Between the outer periphery of the water absorption tube 27 and the closing member 55 and between the joint surfaces 84a and 84b of the half bodies 55a and 55b, ring seals 62a and 62b, which are seal members mounted on the half bodies 55a and 55b, respectively. Liquid tightly sealed by pressure welding.

  By the way, when the borehole 24 reciprocates around the axis L1 at a rotation angle of forward and reverse 300 degrees during excavation work, the blocking member 55 also rotates around the axis L1 together with the borehole 24. Since the ring seals 62a and 62b are slidable, the closing member 55 and the water absorption tube 27 can be rotated relative to each other, and the water absorption tube is rotated by the rotation of the borehole 24 and the closing member 55. 27 also does not rotate.

The inside and the outside of the closing member 55 in a state where the halves 55a and 55b are joined to each other are communicated with each other by a communication path 63 formed in the one half 55a. Further, a gap provided between the inner periphery of the test tube joint 76 constituting the rear end portion of the test tube 24 and the outer periphery of the water absorption tube 27 is used as a test fluid supply passage 64. The communication path 63 of the body 55a is communicated. Then, the borehole liquid stored in the borehole liquid container 66 by the borehole liquid supply pump 65 is supplied through a pipe 81 connected to the communication path 63 (see FIG. 1). At this time, since the end face of the test tube joint 76 constituting the rear end portion of the test tube 24 is in contact with the step portions 83a and 83b formed in the half bodies 55a and 55b, the end surface is supplied by the test fluid supply pump 65. Even if the pressure in the closing member 55 is increased by the borehole liquid, the borehole joint 76 does not come out of the closing member 55 due to the pressure.
The borehole liquid supply pump 65 and the borehole liquid container 66 are installed on the ground E.

  The borehole liquid supplied to the borehole liquid supply passage 64 passes through borehole liquid discharge holes 67 formed at four equiangular intervals around the axis L1 in the borehole joint 76 that forms the tip of the borehole 24. And discharged to the outside of the borehole 24 (see FIG. 3). The borehole liquid is composed of a suspension in which bentonite is the main component and is suspended in water. The borehole liquid has a function of reducing frictional resistance between the borehole 24 penetrating into the ground and the soil around the borehole, and a drilling portion 26a of the drilling member 26. A function of conveying the mud excavated through the water absorption passage, and a function of forming a retaining wall on the inner peripheral surface of the hole drilled in the ground E when the borehole 24 is pulled out from the ground.

  As shown in FIG. 8, a substantially T-shaped three-way joint 68 is connected to the rear end portion 27 b of the water absorption tube 27 that protrudes from the trial tube joint 76 that constitutes the rear end portion of the test tube 24. The three-way joint 68 includes a cylindrical main joint portion 68a and a branch portion 68b branched from a midway portion in the longitudinal direction of the main joint portion 68a. The rear end portion 27b of the water absorption pipe 27 is formed at one end portion of the main joint portion 68a. Is connected, and the water supply pipe 28 protruding from the water absorption pipe 27 passes through the hollow portion of the main joint portion 68a and protrudes from the opening of the other end portion of the main joint portion 68a. The protruding end portion is as shown in FIG. The water stored in the water storage tank 69 installed on the ground E near the work vehicle 1 is supplied by the water supply pump 6 via the water supply pipe 28.

  The gap between the opening at the other end of the main joint 68a and the water supply pipe 28 is liquid-tightly closed by a rubber plug member 70. As a result, the rear end sides of the water suction pipe 27 and the water supply pipe 28 are connected by the three-way joint 68 and the plug member 70 so that they cannot be displaced relative to each other in the axial direction of the pipes 27 and 28. The end of the branching portion 68b of the three-way joint 68 is connected to the upper portion of the water mud separation container 43 via the third connection pipe 71 (see FIG. 1). Thus, the water absorption passage between the inner circumference of the water suction pipe 27 and the outer circumference of the water supply pipe 28 communicates with the third connection pipe 71 via the three-way joint 68, and water is passed as shown by the arrows in FIG. Each flows.

  As shown in FIG. 9, a plurality of purifying liquid discharge holes 73 b that communicate the inside and the outside of the divided pipes 73 are provided at equal intervals along the longitudinal direction of the divided pipes 73. Four holes are formed at equal angular intervals around the axis of the split pipe 73 at each of the plurality of positions. As shown in a partially enlarged view in FIG. 9, a disk-like filter 74 in which fine stainless steel short wires are formed in a nonwoven fabric is attached to the cleaning liquid discharge hole 73b, and the filter 74 is further dropped. A retaining member 75 is attached from above the filter 74 outside the dividing pipes 73. The coarseness of the filter 74 is such that bentonite in the borehole liquid cannot pass through but the purification liquid described later can pass through.

  When performing the borehole operation, it is inconvenient to handle the single long borehole 24. Therefore, before the borehole operation, the borehole 24 is handled in a state of being divided into a plurality of divided tubes 73. . As shown in FIG. 10 and FIG. 11, a trial tube joint 76 is screwed in advance to one end of each of the divided pipes 73, and the divided pipe 73 to which the trial tube joint 76 is screwed is supplied with water. The outer periphery of the water absorption pipe 27 in which the pipe 28 is inserted is mounted at a predetermined interval. The number of the dividing pipes 73 is a little larger than the length corresponding to the length of the borehole 24 penetrating into the ground, and the water absorption pipe 27 and the water supply pipe 28 are longer than the length of the borehole 24 by 10 meters or more. To do. The water absorption pipe 27 is wound on the frame 77 together with the water supply pipe 28 while the divided pipes 73 to which the trial pipe joints 76 are screwed are mounted. Since the caster 77a is provided at the lower part of the frame body 77, the frame body 77 can be easily moved to a desired place with the water absorption pipe 27, the water supply pipe 28, and the plurality of divided pipes 73 mounted thereon. Can do.

(Soil contamination investigation work process)
When investigating soil contamination using the soil contamination investigation device main body 9 described above, the following work process is performed.

(Process of drilling work)
(1) First, a work vehicle equipped with a plurality of divided pipes 73... And a frame body 77 on which a water absorption pipe 27 and a water supply pipe 28 wound in a trough shape are placed, and a soil contamination investigation apparatus main body 9. 1. Transport the borehole pump 65 and other equipment to the site where soil contamination is to be investigated.

(2) Next, after the work vehicle 1 is installed at a point where the drilling is performed, the dividing pipe 73 to which the excavating member 26 to which the water suction pipe 27 and the water supply pipe 28 are connected is screwed out from the frame body 77 and the drilling mechanism unit. The excavation part 26 a of the excavation member 26 is grounded to the ground E.
It should be noted that the water absorption pipe joint member 38 and the water supply pipe joint member 35 into which the water absorption pipe 27 and the water supply pipe 28 are respectively fitted are screwed into the connecting member 37 and the excavation part 26a of the excavation member 26, respectively. In this case, only the middle part of the screw length is screwed in, so that there is a margin for screwing, and even when the drill tube 24 reciprocates around the axis L1 at a rotation angle of 300 degrees forward / reverse at the time of excavation, Accordingly, the water absorption pipe 27 and the water supply pipe 28 are also prevented from rotating.

  (3) Next, with the engine 4 in operation, the third operating element 14c of the operation panel 14 is operated to operate the hydraulic pump 17b and extend the hydraulic cylinder 17a to raise the base 11 to the highest position. At the highest position, the borehole 24 is firmly held by the clamp 5a of the borehole mechanism 5.

  (4) Next, the operation switch 25a of the control panel 25 is operated to drive the test tube rotation motor 5b, and the test tube 24 is reciprocally rotated at a rotation angle of 300 degrees forward and reverse. At this time, the operation of the hydraulic pump 17b is stopped to reduce the hydraulic pressure of the hydraulic cylinder 17a, and a downward thrust is applied to the borehole 24 by the load of the pedestal 11 itself on which the soil contamination investigation device body 9 is installed. Excavation is performed by the excavation member 26 by the thrust and rotation of the borehole 24. This eliminates the need for special load applying means for penetrating the borehole 24 into the ground.

  (5) On the other hand, the water stored in the water storage tank 69 is supplied via the water supply pipe 28 by the water supply pump 6, and the water is injected from the water supply hole 33 formed in the excavation part 26 a of the excavation member 26. . By this water injection and agitation by the rotation of the excavation part 26a, the excavated soil becomes muddy water and is recovered from the water recovery holes 32b of the excavation member 26 to the water recovery part 32, and then the muddy water is vacuum pumped. 7 is introduced into the water mud separation container 43 through the water absorption passage between the water absorption pipe 27 and the water supply pipe 28.

(6) The water after the mud is separated in the water mud separation container 43 passes through the mud filter 72 disposed in the middle of the first connection pipe 44 by the pressure reducing action by the vacuum pump 7 to be the first. When the water level introduced into the water storage container 8a reaches the preset water level with the introduced water, the controller 23 receives a signal from the first water level detection sensor 48a, and the controller 23 23 closes the first electromagnetic valve 46a and opens the second electromagnetic valve 46b. At this time, the third electromagnetic valve 46c and the fourth electromagnetic valve 46d are closed.
Thereby, the water from the water mud separation container 43 is introduced into the second water storage container 8b through the first connection pipe 44 and the second electromagnetic valve 46b by the pressure reducing action by the vacuum pump 7. While the water is being introduced into the second water storage container 8b, the controller 23 opens the third electromagnetic valve 46c, and the water stored in the first water storage container 8a is drained through the first drain pipe 47a. The At this time, the controller 23 opens the fifth electromagnetic valve 46e and drives the pressurizing pump 52, whereby the pressure in the first water storage container 8a is increased via the second connection pipe 51, and the first The water in the water storage container 8a is forcibly discharged.

  (7) When the water in the first water storage container 8a is discharged and the water level in the first water storage container 8a reaches a preset minimum water level, the controller 23 receives a signal from the first water level detection sensor 48a. The controller 23 stops the driving of the pressurizing pump 52 and closes both the third electromagnetic valve 46c and the fifth electromagnetic valve 46e.

(8) When the water level in the second water storage container 8b reaches the preset maximum water level, the controller 23 receives a signal from the second water level detection sensor 48b, and the controller 23 opens the first electromagnetic valve 46a. At the same time, the second electromagnetic valve 46b is closed. As a result, the water from the water mud separation container 43 is introduced again into the first water storage container 8a through the first connection pipe 44 and the first electromagnetic valve 46a by the pressure reducing action of the vacuum pump 7. While the water is being introduced into the first water storage container 8a, the controller 23 opens the fourth electromagnetic valve 46d, and the water stored in the second water storage container 8b is drained through the second drain pipe 47b. The
At this time, the controller 23 opens the sixth electromagnetic valve 46f and drives the pressurizing pump 52, whereby the pressure in the second water storage container 8b is increased via the second connection pipe 51 and second. The water in the water storage container 8b is forcibly discharged. When the water in the second water storage container 8b is discharged, the controller 23 stops driving the pressurizing pump 52 and closes both the fourth electromagnetic valve 46d and the sixth electromagnetic valve 46f. The gas sucked alternately by the vacuum pump 7 from the first water storage container 8 a or the second water storage container 8 b is discharged to the exhaust pipe 53.

  (9) Hereinafter, the same process is repeated, and water is continuously supplied into the hole of the ground E through the water supply pipe 28, and the supplied water is continuously supplied to the first water storage container 8a or the second water storage water. The containers 8b are alternately collected.

  (10) The borehole liquid is supplied to the borehole supply path 64 between the borehole 24 and the water absorption pipe 27 by the borehole supply pump 65. The borehole liquid is discharged to the outside of the borehole 24 through the borehole discharge holes 67 of the borehole 24. A part of the drained borehole liquid is combined with the muddy water recovered from the water recovery holes 32b of the excavating member 26, and the water absorption between the water absorption pipe 27 and the water supply pipe 28 by the pressure reducing action by the vacuum pump 7. Flow through the passage. At this time, the mud in the mud is introduced into the water mud separation container 43 while being transported by the borehole liquid.

  (11) When the pedestal 11 is lowered to the lowest position, the operation switch 25a of the control panel 25 is operated to stop the borehole rotation motor 5b to stop the rotation of the borehole 24. Next, the clamp 5a of the borehole mechanism unit 5 is loosened to release the gripping of the borehole 24, the third operating element 14c of the operation panel 14 is operated, the hydraulic pump 17b is operated, the hydraulic cylinder 17a is extended, and the base 11 is extended. Is raised to the highest position, and the borehole 24 is firmly gripped again by the clamp 5a at the highest position.

  (12) Next, the operation switch 25a of the control panel 25 is operated to drive the borehole rotation motor 5b to rotate the borehole 24 again, and the third operation element 14c of the operation panel 14 is operated to operate the hydraulic pump 17b. Is stopped to reduce the hydraulic pressure of the hydraulic cylinder 17a. Thereby, excavation is performed by the excavation member 26 by the load of the base 11 itself.

  (13) When the underground depth is increased by excavation by the excavating member 26 and the length of the borehole 24 is insufficient, the borehole rotation motor 5b is stopped by operating the operation switch 25a of the control panel 25, and the borehole The rotation of the pipe 24 is stopped and the borehole liquid supply pump 65 is also stopped.

  (14) The half members 55 a and 55 b of the closing member 55 fixed to the test tube joint 76 constituting the rear end portion of the test tube 24 are released from the test tube joint 76 by releasing the locking by the locking member 61. Thereafter, the rear end portion of the test tube 24 from which the next split tube 73 (the test tube joint 76 is screwed to one end) is moved along the water absorption tube 27 from the frame body 77 and the closing member 55 is detached. The next divided pipe 73 is screwed into the (trial bore joint 76), and the divided pipe 73 is added. The half members 55 a and 55 b of the closing member 55 are attached and joined to the other end portion (the test tube joint 76) of the joined divided pipe 73 and locked by the locking member 61.

  (15) Next, the operation switch 25a of the control panel 25 is operated to drive the borehole rotation motor 5b to rotate the borehole tube 24 again, and also drive the borehole fluid supply pump 65 to supply the borehole fluid again.

  (16) Thereafter, the same process is repeated, and the excavation member 26 excavates to a predetermined depth in the ground.

(Soil contamination investigation process)
The investigation of soil contamination is carried out in the following work process. In addition, control of operation | movement of a solenoid valve, a pump, etc. in the following work process is all performed by the controller 23.
(1) The water flowing through the first connection pipe 44 after passing through the mud filter 72 is periodically introduced into the water introduction container 85 via the introduction pipe 86a. That is, the open / close valve 91 that has been opened is closed, and at the same time, the introduction control valve 87 and the derivation control valve 88 that have been closed are both opened, so that the valve after passing through the mud filter 72 is removed. All of the water flowing through the first connection pipe 44 is introduced into the introduction pipe 86 a and water is stored in the water introduction container 85. This state is performed for a certain time. At this time, both the ninth electromagnetic valve 93a and the ninth electromagnetic valve 94a are closed, and the water supply pump 96 is also stopped.

  (2) In the state where the predetermined time has passed and the water introduction container 85 is filled with water, passes through the outlet pipe 86b, and again flows into the first connection pipe 44, the on-off valve 91 is Simultaneously with the opening, both the introduction control valve 87 and the derivation control valve 88 are closed. Thereby, the water flowing through the first connection pipe 44 flows directly toward the first water storage container 8a or the second water storage container 8b without detouring via the introduction pipe 86a and the outlet pipe 86b. On the other hand, the inside of the introduction pipe 86a, the water introduction container 85, and the outlet pipe 86b between the introduction control valve 87 and the derivation control valve 88 is sealed by the introduction control valve 87 and the derivation control valve 88 in a state where water is filled. The

(3) The water supply pump 96 is driven at the same time when the ninth electromagnetic valve 93a and the tenth electromagnetic valve 94a are both opened, and all of the water sealed by the introduction control valve 87 and the outlet control valve 88 is in the fourth connection. Water is transferred to the upper part of the vaporization container 92 through the pipe 93 and falls. At this time, the air supply pump 102 is driven, the air accumulated in the upper part of the vaporization container 92 is sucked from one end of the air circulation pipe 101 and supplied to the water stored in the lower part of the vaporization container 92, and this operation is repeated. Thus, the air in the vaporization vessel 92 circulates through the air circulation pipe 101. At this time, the twelfth electromagnetic valve 98a is closed.
As a result, the water stored in the lower part in the vaporization container 92 and the air circulated by the air supply pump 102 come into contact with each other, and VOCs dissolved in the water are vaporized and mixed with the air.

  (4) The mixed air generated by vaporizing VOCs in the vaporization vessel 92 and mixing with the air passes through the circulation circulation pipe 103 for measurement by the operation of a pump (not shown) built in the concentration measuring device 104. After being introduced into the concentration measuring device 104, it is returned to the vaporization container 92 through the measurement circulation return pipe 109, and is returned to the vaporization container 92 through the measurement circulation forward pipe 103 and the measurement circulation return pipe 109. The mixed air circulates. At this time, the first three-way electromagnetic valve 103a is controlled so that the vaporization container 92 and the concentration measuring device 104 communicate with each other via the measurement circulation forward pipe 103, and the second three-way electromagnetic valve 109a is connected to the concentration measuring device 104. The vaporizing container 92 is controlled to communicate with the measurement circulation return pipe 109.

While the mixed air in the vaporization vessel 92 circulates through the measurement circulation forward pipe 103 and the measurement circulation return pipe 109, the concentration measuring device 104 measures the concentration of VOCs contained in the mixed air. After the measurement, the signal of the measurement value and the signal of the depth data measured by the encoder 22 are transmitted to the controller 23 and stored in the memory 23a in the controller 23 as measurement value data.
At this time, the measured value data by the concentration measuring device 104, the depth data by the encoder 22, and the time measured by the timer 23b in the controller 23 are associated with each other and stored in the memory 23a. The concentration of VOCs at each depth in the inside is stored in the memory 23a together with the time when the measurement was performed.
In addition, since the measured value data by the concentration measuring device 104 and the encoder 22 is stored in the memory 23a in the controller 23, the stored measured value data is connected to the controller 23 via an electric wire (not shown). It can also be appropriately converted by an external device and displayed on the monitor of the external device.

(5) After the measurement of the concentration of VOCs by the concentration measuring device 104 is completed, the ninth electromagnetic valve 93a is closed and the driving of the water supply pump 96 and the air supply pump 102 is stopped. Next, the twelfth electromagnetic valve 98a and the eleventh electromagnetic valve 110a are opened, and the cleaning water supply pump 122 and the drainage pump 106 are driven. As a result, the water in the cleaning water tank 115 is forcibly supplied to the vaporizing container 92 through the cleaning water pipe 117 by the cleaning water supply pump 122 and the inside of the vaporizing container 92 is cleaned. The washed water is forcibly discharged from the third drain pipe 98 by the drain pump 106. In this step, when the time required for cleaning the vaporization container 92 elapses, the driving of the drain pump 106 and the cleaning water supply pump 122 is stopped and the eleventh electromagnetic valve 110a and the twelfth electromagnetic valve 98a are closed. .
(6) Further, the first three-way solenoid valve 103a is controlled to switch the ventilation pipe 108 to communicate with the concentration measuring device 104, while the second three-way solenoid valve 109a is controlled to connect the exhaust pipe 116 to the concentration measuring device. It is switched so as to communicate with 104. As a result, air dried by the dehumidifying filter 112 is introduced into the concentration measuring device 104 through the ventilation pipe 108 by the operation of a pump (not shown) built in the concentration measuring device 104, and the concentration measurement is performed by the air. The inside of the device 104 is cleaned. The cleaned air is discharged to the outside through the exhaust pipe 116. Thereby, the next concentration measurement of VOCs by the concentration measuring device 104 can be accurately performed. In this step, when the time required for cleaning the concentration measuring device 104 elapses, the first three-way solenoid valve 103a is controlled to switch the measurement circulation forward tube 103 to communicate with the concentration measuring device 104, while the second The three-way solenoid valve 109 a is controlled and switched so that the measurement circulation return pipe 109 communicates with the concentration measuring device 104.
(7) Thereafter, the same process is repeated at a constant cycle.

(Work process of soil contamination survey at other points)
When soil contamination surveys at other points in the same survey area are conducted after the soil contamination survey at the scheduled site is completed, the following work process is used.

  (1) The operation switch 25a of the control panel 25 is operated to stop the borehole rotation motor 5b to stop the rotation of the borehole 24 and also stop the borehole liquid supply pump 65.

  (2) After detaching the closing member 55 fixed to the rear end portion of the borehole 24 (the borehole joint 76), the third operator 14c of the operation panel 14 is operated with the borehole 24 held by the clamp 5a. Then, the hydraulic pump 17b is operated, the base 11 is raised, and the borehole 24 is pulled out from the ground. At this time, since a retaining wall is formed in the ground in contact with the outer periphery of the borehole 24, the frictional force acting between the outer circumference of the borehole 24 and the ground when the borehole 24 is pulled out is reduced. Is done.

  (3) Next, the split tube 73 of the test tube 24 drawn to the ground is rotated, and the split tube 73 and the rear end portion of the test tube 24 penetrating into the ground (the test tube joint 76). After loosening the screw and removing the split pipe 73 drawn to the ground, the clamp 5a of the borehole mechanism 5 is loosened to release the grip of the borehole 24, and the third operator 14c of the operation panel 14 is operated. The operation of the hydraulic pump 17b is stopped, the hydraulic cylinder 17a is contracted and the pedestal 11 is lowered to the lowest position, and the borehole 24 penetrating into the ground is firmly held by the clamp 5a again.

  (4) The detached divided pipe 73 is placed on the frame 77 in a state of being looped around the outer periphery of the water suction pipe 27 into which the water supply pipe 28 is inserted, with the trial pipe joint 76 screwed to one end. .

  (5) Next, in the state where the borehole 24 is gripped by the clamp 5a, the third operation element 14c of the operation panel 14 is operated to operate the hydraulic pump 17b, the pedestal 11 is raised again, and still penetrates into the ground. The drilling tube 24 is pulled out.

(6) Thereafter, the same process is repeated, and all the boreholes 24 penetrating into the ground are pulled out.
Note that the water supply pipe 28 and the water absorption pipe 27 remain connected to the excavation member 26 during the above-described extraction operation of the test tube 24, but before the test tube 24 is extracted, The water supply pipe 28 and the water absorption pipe 27 projecting outward from the ends are rotated to rotate the water supply pipe 28 and the water supply pipe 27, respectively. The joint member 38 may be detached from the excavation member 26 and the water supply pipe 28 and the water absorption pipe 27 may be drawn out from the borehole 24 in advance.

  (7) After all the boreholes 24 that have penetrated into the ground are pulled out, the first operation element 14a and the second operation element 14b of the operation panel 14 of the work vehicle 1 are operated to move the work vehicle 1 to another point. The frame body 77 and the like are also moved to that point, and the soil contamination at that point is investigated in the same steps as the steps (1) to (6) described above.

According to the soil sampling device for soil contamination investigation configured as described above, the introduction pipe 86a, the water introduction container 85, and the outlet pipe 86b located between the pair of control valves 87, 88 are connected to the pair of control valves 87, 88. Since it was made to seal with 88, it can extract | collect in the sealed state, without exposing the water in which VOCs melt | dissolved to air. For this reason, measurement accuracy improves by measuring the density | concentration of VOCs contained in the extract | collected water, and can investigate a soil contamination correctly.
Further, since the introduction pipe 86a, the water introduction container 85, and the outlet pipe 86b positioned between the pair of control valves 87 and 88 are sealed with the pair of control valves 87 and 88, the water in which VOCs are dissolved is air. The structure for collecting in a sealed state without being exposed to water can be simplified and can be provided at low cost.

  Further, according to the soil contamination investigation sample collecting apparatus according to this embodiment, since water is introduced into the water introduction container 85 by closing the on-off valve 91, water is introduced into the water introduction container 85. The structure can be simplified.

  Further, according to the soil contamination investigation apparatus according to this embodiment, VOCs dissolved in the water collected by the water introduction container 85 are vaporized in the vaporization container 92, and the concentration of the vaporized VOCs is measured by the concentration measuring apparatus 104. Therefore, the measurement accuracy of the concentration of VOCs is improved, and the soil contamination can be accurately investigated.

  Moreover, according to the soil contamination investigation apparatus according to this embodiment, VOCs contained in the water transferred to the vaporization container 92 are vaporized in the vaporization container 92 by supplying air to the vaporization container 92 by the air supply pump 102. At the same time, mixed air is generated by mixing with the air in the vaporization container 92, and the concentration of VOCs contained in the mixed air is measured by the concentration measuring device 104. Therefore, the air is sufficiently brought into contact with water in which VOCs are dissolved. VOCs dissolved in water can be reliably vaporized. For this reason, the measurement precision of the density | concentration of VOCs improves and it can investigate a soil contamination correctly.

  Further, according to the soil contamination investigation device according to this embodiment, air accumulated in the upper part of the vaporization vessel 92 is sucked from one end of the air circulation pipe 101 by the air supply pump 102 and the sucked air is again drawn into the air circulation pipe. The VOCs contained in the water transferred to the vaporization vessel 92 are vaporized in the vaporization vessel 92 and mixed with the air in the vaporization vessel 92 by supplying the water stored in the lower part of the vaporization vessel 92 from the other end of the vaporization vessel 101. Since the mixed air is generated and the concentration of VOCs contained in the mixed air is measured by the concentration measuring device 104, only the air accumulated in the upper part of the vaporization vessel 92 is brought into contact with the water in which the VOCs are dissolved. Thus, VOCs dissolved in water can be vaporized. For this reason, the amount of air used for vaporizing VOCs can be reduced as much as possible, and the content ratio of VOCs to air does not need to be reduced. Therefore, the measurement accuracy of the concentration of VOCs is improved, and the investigation of soil contamination can be performed accurately. It can be carried out.

  In addition, according to the soil contamination investigation apparatus according to this embodiment, the concentration measuring apparatus 104 is configured to circulate the mixed air accumulated in the upper portion of the vaporization container 92 through the measurement circulation forward pipe 103 and the measurement circulation return pipe 109. Since the concentration of VOCs contained in the mixed air is measured while passing through, the concentration can be measured while the content ratio of VOCs to air is kept constant. For this reason, since the concentration is less likely to change while measuring the concentration of VOCs, the measurement accuracy is improved, and the soil contamination can be accurately investigated.

  Further, according to the soil contamination investigation device according to this embodiment, the respective operation controls of the ninth electromagnetic valve 93a, the tenth electromagnetic valve 94a, the water pump 96, the introduction control valve 87, the derivation control valve 88, and the air supply pump 102. Since the controller 23 outputs the data signal of the measured value measured by the concentration measuring device 104, the concentration of VOCs is automatically measured and labor saving of the soil contamination investigation work can be achieved. it can.

  In embodiment mentioned above, although the example which arrange | positions two containers, the 1st water storage container 8a and the 2nd water storage container 8b, was shown as a water storage container, this invention is not restricted to such a structure. Three or more containers may be arranged, and switching may be performed so that water is stored in order from some of the containers. For example, in the case where six water storage containers are provided, switching may be performed so that water is stored in order two by two.

  In this embodiment, the pressurizing pump 52 is disposed so as to forcibly discharge the water stored by pressurizing the water storage containers 8a and 8b. However, the present invention is constrained by such a configuration. Alternatively, the pressurizing pump 52 can be omitted. In that case, the time required for draining from the water storage containers 8a and 8b becomes longer, and there is a possibility that drainage will not be completed by the time when the collected water is stored again. However, the number of water storage containers is increased accordingly. You can do it.

  Moreover, in this embodiment, although the example which attracts | sucks water by pressure reduction with the vacuum pump 7 and stores water in the 1st water storage container 8a and the 2nd water storage container 8b was shown, this invention is such a structure. Instead of being trapped, a general-purpose pump such as a spiral pump may be used instead of the water storage containers 8a and 8b and the vacuum pump 7 or the like. In this case, the pump constitutes a water absorption means.

  Further, in this embodiment, the inside of the water supply pipe 28 is a water supply passage, the gap between the outer periphery of the water supply pipe 28 and the inner periphery of the water absorption pipe 27 is a water absorption passage, and the inner circumference of the borehole 24 and the outer circumference of the water absorption pipe 27. Although the borehole liquid supply passage 64 is defined as the gap between the two, the three passages may be selected as appropriate without being limited by such a configuration.

  In this embodiment, the water recovery holes 32b are formed in the excavation member main body 26b of the excavation member 26. However, the borehole 24 in the vicinity of the excavation member 26 (the borehole 24) A plurality of water recovery holes are drilled in the drill pipe joint 76 constituting the tip portion), while the water recovery holes 32b of the drilling member body 26b are abolished or left without being abolished. It may be left.

  Further, in this embodiment, the borehole discharge hole 67 is formed in the borehole joint 76 that forms the tip of the borehole 24, but the borehole supply passage 64 is excavated without being restricted by such a configuration. A borehole discharge hole 67 of the borehole joint 76 constituting the tip of the borehole 24 is formed while a borehole discharge hole extending to the inside of the member 26 and communicating therewith is drilled at an appropriate position of the drilling member 26. It may be abolished or left perforated without being abolished.

  Further, in this embodiment, the water absorption pipe joint member 38 to which the water absorption pipe 27 is fitted and the connection member 37 of the excavation member 26 are connected by a screwed structure. May be connected by a fitting structure that simply fits each other. Even with this configuration, the water absorption pipe 27 and the water supply pipe 28 are connected by the three-way joint 68, and the water supply pipe 28 is screwed into the excavation part 26a via the water supply pipe joint member 35. The water-absorbing-pipe joint member to which the water-absorbing pipe 27 is fitted does not come out of the connecting member 37 of the excavating member 26 and leave.

  In this embodiment, the test tube 24 is reciprocally rotated around the axis L1 at a rotation angle of 300 degrees forward / reverse by the test mechanism unit 5 in this embodiment. The tube 24 may be rotated in a certain direction. In this case, the connection between the water-absorbing pipe joint member 38 fitted with the water-absorbing pipe 27 and the connecting member 37 of the excavation member 26 and the water-feed pipe joint member 35 fitted with the water supply pipe 28 and the excavation part 26 a of the excavation member 26. And a liquid-tight connection structure in which relative displacement in the axial direction is impossible and relative rotation is possible.

  Further, in this embodiment, the test tube 24 in which the cleaning liquid discharge holes 73b are formed is used. However, the test hole in which the cleaning liquid discharge holes 73b are not formed without being constrained by such a configuration. A tube may be used. When such a borehole is used, the borehole should be withdrawn from the ground as soon as the soil contamination survey is completed. During the drawing process, the borehole should be pulled out while supplying the borehole into the borehole. For example, the hole in the ground after pulling out the borehole will not be filled with the borehole liquid and the hole will not collapse.

  And, after pulling out the borehole, when conducting periodic water quality surveys and soil purification, it is necessary to perform the work of penetrating the borehole in which the drainage hole is drilled. However, since the hole is only filled with the borehole liquid, the borehole can be penetrated into the hole only by applying a relatively small pressing force to the borehole. For this reason, it is not necessary to fix the excavation member 26 as described above to the tip portion of the borehole, and it is sufficient to fix an inexpensive member with a sharp tip. As a result, the excavation member can perform excavation work. Since it is sufficient to prepare only one to fix to only one borehole to be performed, the cost of the entire tool can be obtained even if a drilling member provided with an expensive drilling bit with excellent drilling performance such as a diamond bit is used. There is almost no increase.

  Furthermore, although the soil contamination investigation device main body 9 of this embodiment is controlled by the controller 23 and automatically operates, the introduction control valve 87 and the derivation control valve 88 are not limited to such a configuration. , On-off valve 91, ninth electromagnetic valve 93a, tenth electromagnetic valve 94a, twelfth electromagnetic valve 98a, first three-way electromagnetic valve 103a, second three-way electromagnetic valve 109a and eleventh electromagnetic valve 110a are manually operated on-off valves or switching. The valve is manually opened / closed or switched at a necessary timing as a valve, and supplied to each motor (not shown) for driving the water supply pump 96, the air supply pump 102, the drainage pump 106, and the cleaning water supply pump 122. You may make it operate artificially at the required timing also in supply of electric power, or the stop.

(Second Embodiment)
Next, a second embodiment of the soil contamination investigation apparatus according to the present invention will be described in detail with reference to FIGS. FIG. 12 is a diagram illustrating a purification instrument according to the second embodiment with a part thereof broken, and FIG. 13 is a diagram schematically illustrating a state in which the soil contamination investigation device is used. FIG. 14 is a cross-sectional view showing a state in which the purifying instrument is installed in the borehole, and FIG. 15 is a diagram illustrating the soil contamination being purified by the drilling pipe in which the purifying instrument is installed and penetrated into the ground. It is the figure which showed the state which has been broken. In this embodiment, a part of the equipment mounted on the work vehicle 1 described in the first embodiment is used. 12 to 15, the same or equivalent members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Further, in FIG. 13, for the convenience of drawing, the ratios of the scales of the respective constituent members are shown different from each other.

  In the soil contamination investigation of the first embodiment described above, the borehole 24 is pulled out from the ground where the investigation is completed, but the borehole 24 can be left penetrating into the ground. . In this manner, water is supplied while supplying water into the borehole 24 to remove bentonite in the borehole liquid clogged in the filter 74 of the purified liquid discharge hole 73b, and then the purified liquid is discharged from the purified liquid discharge hole 73b. As the groundwater is discharged and supplied to the ground, groundwater is sucked in by the water-absorbing means from the other boreholes 24 similarly penetrated into the ground by the above-mentioned drilling work, and the concentration of VOCs contained in the sucked groundwater is determined. The concentration is measured by the concentration measuring device 104 of the contamination investigation device. Examples of the purification liquid in this case include a purification liquid produced by dissolving ozone, hydrogen peroxide, or a surfactant in water at a predetermined ratio, and water.

  The soil contamination investigation according to this embodiment will be described in detail. A purification instrument 105 shown in FIG. 12 is inserted into a borehole 24 that has penetrated into the ground. The purifying instrument 105 includes a stainless steel purifying liquid supply pipe 107 for supplying the purifying liquid, a stainless steel air supplying pipe 111 for supplying air, and the pipes 107 and 111 arranged in parallel. And a pair of rubber expansion tubes 113 and 114 inserted in a state. In FIG. 12, as shown partially enlarged, stainless steel cylindrical bases 118, 118 are respectively disposed inside the upper end and lower end of the expansion tube 113, and the upper end of the expansion tube 114. In addition, stainless steel cylindrical bases 118 and 121 are respectively fitted inside the lower end portions. In the through holes drilled through the base 118, the longitudinal intermediate portions of the cleaning liquid supply pipe 107 and the air supply pipe 111 are inserted in an airtight manner, and are inserted into the bottomed holes drilled in the base 121. Each of the tip ends of the cleaning liquid supply pipe 107 and the air supply pipe 111 is fitted in an airtight manner.

  Stainless steel annular fasteners 123 are provided around the outer circumferences of the end portions of the expansion tubes 113 and 114 into which the caps 118 and 121 are inserted, and the expansion tubes 113 and 114 are respectively connected to the caps 118 and 114 by the fasteners 123. It is firmly tightened to 121. As a result, airtight expansion chambers 113a and 114a are formed in the pair of expansion tubes 113 and 114, respectively, and the communication holes 124 and 124 communicating with the expansion chambers 113a and 114a, respectively, are arranged in the longitudinal direction of the air supply tube 111. It is drilled in the part. Between the expansion pipes 113 and 114 in the purification liquid supply pipe 107, a purification liquid supply hole 125 is formed in the vicinity of the expansion pipe 114.

  A purified liquid supply connecting pipe 126 and an air supply connecting pipe 127 made of Teflon resin are airtightly connected to the purified liquid supply pipe 107 and the air supply pipe 111 protruding from the expansion pipe 113, respectively, and penetrated into the ground. When the purification instrument 105 is inserted into the borehole 24, the length of at least one of the purification liquid supply connection pipe 126 and the air supply connection pipe 127 is long so that the depth of the purification instrument 105 in the ground can be grasped. It is good to mark a mark representing

  In the case of performing the soil contamination purification and investigation work using the purification tool 105 described above, a plurality of drilled holes inserted into the ground across the contaminated area by the drilling work described in the first embodiment. Each of the purifying instruments 105 is inserted between the expansion tubes 113 and 114 to a desired depth at which the purifying fluid discharge hole 73b of the drill tube 24 is located. The depth at this time is the depth at which it is desired to purify soil contamination, and the depth at which each purifying instrument 105 is inserted into each borehole 24 is the same. As shown in FIG. 13, each of the purifying fluid supply connection pipes 126 arranged in some of the plurality of boreholes 24 (two boreholes 24 located on the left and right sides in FIG. 13). The end portion is connected to the purification liquid supply collecting pipe 128, and the purification liquid supply pump 132 for supplying the purification liquid stored in the purification liquid storage tank 131 is connected to the end of the purification liquid supply collecting pipe 128. Yes. The cleaning liquid storage tank 131 is installed on the ground E, and the cleaning liquid supply pump 132 is mounted on the base 11 of the work vehicle 1.

  Moreover, each end part of the purification liquid supply connection pipe 126 arranged in the remaining boreholes 24 (three boreholes 24 located on the center side in FIG. 13) among the plurality of boreholes 24 is a water absorption pipe 133. In the middle of each of the purifying liquid supply connecting pipes 126, water-absorbing electromagnetic valves 134a, 134b, 134c that open and close are respectively disposed. The insides of the water absorption pipe 133 and the purification liquid supply connecting pipe 126 and the purification liquid supply pipe 107 connected to the water absorption pipe 133 constitute a water absorption passage in the present invention. The same water absorption means 50 as in the first embodiment is connected to the end of the water absorption pipe 133, and in the middle of the water absorption pipe 133 between the water absorption electromagnetic valves 134a, 134b, 134c and the water absorption means 50, The same soil contamination investigation apparatus main body 9 as that in the first embodiment is connected. In this case, the water absorption pipe 133 is connected to the soil contamination investigation apparatus main body 9 so as to correspond to the first connection pipe 44 in the first embodiment. The water absorbing electromagnetic valves 134a, 134b, and 134c are connected to the controller 23 of the control panel 25 mounted on the base 11 of the work vehicle 1 via electric wires (not shown), respectively, and are controlled to be opened and closed by the controller 23. .

  An end of each air supply connecting pipe 127 is connected to an air supply collecting pipe 129, and an air supply pump 135 for supplying air to the air supply collecting pipe 129 is connected to the end of the air supply collecting pipe 129. It is connected. The air supply pump 135 is mounted on the base 11 of the work vehicle 1. The purification liquid supply pump 132 and the air supply pump 135 are connected to the controller 23 via electric wires (not shown), respectively, and the controller 23 controls operation or stoppage of the operation. Further, the soil contamination investigation device main body 9 and the water absorption means 50 are also connected to the controller 23 via electric wires (not shown), respectively, as in the first embodiment.

  After inserting the cleaning instrument 105 into each of the plurality of boreholes 24, the controller 23 operates the air supply pump 135 to supply air from the communication holes 124 and 124 of the air supply pipe 111, and The expansion tubes 113 and 114 are expanded until they are pressed (see FIG. 14). The air pressure in the expansion tubes 113 and 114 is maintained in a state where the expansion tubes 113 and 114 are pressed against the inner wall of the borehole 24, and in this state, the purification liquid supply pump 132 is operated by the controller 23 to operate the purification liquid storage tank 131. The purifying liquid stored in is supplied from the purifying liquid supply hole 125 of the purifying liquid supply pipe 107 to the expansion pipes 113 and 114 in the borehole tube 24. After that, the purification liquid is discharged into the ground from the purification liquid discharge holes 73b of the two boreholes 24 located on the left and right sides in FIG. At this time, the controller 23 selects and opens only one of the water absorbing electromagnetic valves 134a, 134b, and 134c, and closes the other two water absorbing electromagnetic valves.

  Thus, as shown in FIG. 15, the VOCs eluted from the soil by the purification liquid discharged from the purification liquid discharge hole 73 b... Of the borehole 24 are located on the center side in FIG. Of the boreholes 24, the water is sucked from the purified liquid discharge holes 73b of the borehole 24 (the central borehole 24 in FIG. 15) into which the purification device 105 with the water absorption solenoid valve opened is inserted. This suction removes VOCs in the ground and purifies the soil. Further, the concentration of VOCs dissolved in the sucked liquid is measured by the concentration measuring device 104 of the soil contamination investigation device main body 9, and this measurement data is measured by the timer 23b of the controller 23 after the purification work is started. The memory 23a of the controller 23 is also associated with the elapsed time. By confirming the measurement data stored in the memory 23a in real time, the progress of purification in the ground can be easily confirmed. In FIG. 15, what is indicated by reference numeral 119 is a path through which VOCs eluted from the soil by the cleaning liquid discharged from the cleaning liquid discharge hole 73b of the borehole 24 flowed together with the cleaning liquid and groundwater. The reference numeral 120 indicates a retaining wall formed in the ground by the borehole liquid.

The water absorption electromagnetic valves 134a, 134b, and 134c are controlled to be opened and closed by the controller 23 so that they are sequentially opened at regular intervals, and the measurement data measured by the concentration measuring device 104 of the soil contamination investigation device main body 9 However, it is stored in the memory 23a of the controller 23 by distinguishing it for each borehole 24 in which the water absorption electromagnetic valve is opened and the cleaning liquid or the like is sucked. Thereby, it is possible to easily check the progress of purification at each point where the borehole 24 is inserted.
In addition, the depth at which each purification instrument 105 is inserted into each borehole 24 is appropriately changed for each position of the purification liquid discharge hole 73b to purify all the soil-contaminated underground locations, and the purification. Is confirmed by measuring the concentration of VOCs by the concentration measuring device 104 of the soil contamination investigation device main body 9.

In this embodiment as well, structural changes similar to those in the first embodiment can be made for the same components as those in the first embodiment described above, and the same as in the first embodiment. Needless to say, there are also effects and effects.
Further, the purification liquid supply pump 132, the air supply pump 135, and the water absorption electromagnetic valves 134a to 134c in the soil contamination investigation apparatus of this embodiment are controlled by the controller 23 so as to automatically operate. Without being constrained by a simple configuration, the power supply to each motor (not shown) for driving the purification liquid supply pump 132 and the air supply pump 135 or the stop thereof is artificially operated at a necessary timing, and is used for water absorption. The electromagnetic valves 134a to 134c may be manually opened and closed at a necessary timing as manual open / close valves.
Further, in this embodiment, while supplying the cleaning liquid, the supplied cleaning liquid is sucked, and the concentration of VOCs dissolved in the sucked liquid is determined as the concentration measuring device 104 of the soil contamination investigation apparatus main body 9. However, the concentration of VOCs dissolved in the aspirated groundwater is determined by sucking groundwater from the borehole tube 24 without being supplied with the purifying solution without being trapped by such a configuration. It can also be measured by the concentration measuring device 104 of the contamination investigation device main body 9.

  In this embodiment, the controller 23 selects and opens only one water absorbing electromagnetic valve among the water absorbing electromagnetic valves 134a, 134b, and 134c disposed in each of the purification liquid supply connecting pipes 126. The other two water-absorbing solenoid valves are closed, but without being restricted by such a configuration, the number of boreholes 24 penetrating into the ground is increased and the boreholes 24 are purified. A water absorbing solenoid valve of the purifying instrument 105 disposed in a group of two or more boreholes 24 penetrating at a point close to each other, the controller 105 and the water absorbing solenoid valve being respectively disposed; The concentration of the VOCs sucked from the two or more groups of purified liquid supply connection pipes 126 and dissolved in the sucked liquid is measured by the concentration measuring device 104 of the soil contamination investigation device body 9. It may be so that.

  In the soil contamination investigation of the above-described embodiment, the purification instrument 105 is arranged in the borehole 24 that has been penetrated into the ground at the point where the investigation has been completed. The tube 24 is pulled out while supplying the borehole liquid into the borehole 24, and the borehole 24 'as shown in FIGS. 16 to 18 is inserted into the hole after the bored tube 24 is pulled out. It is also possible to use the borehole 24 'instead of 24 to perform underground purification. 16 is a cross-sectional view showing a part of the tip side of the borehole 24 ′, and FIG. 17 is an enlarged cross-sectional view taken along the lines C1-C1 and C2-C2 in FIG. 18 is a view showing a state in which the soil contamination is being purified by the test tube 24 ′ in which the purification device 105 is installed and penetrated into the ground. In FIG. 16, for the sake of drawing, the borehole 24 'is divided at the middle portion. Also, the enlarged cross-sectional views along the arrow C1-C1 line and the arrow C2-C2 line in FIG. 16 have the same shape, and therefore only one enlarged cross-sectional view is shown in FIG. 17 for convenience of drawing. As shown in FIG. 16, the borehole 24 'has a penetration part 136 whose tip is pointed in a conical shape, a split pipe 73' connected to the penetration part 136, and ends of the split pipe 73 'screwed together. It is configured with a test tube joint 76 (same as in the first embodiment, not shown in FIG. 16) that is connected by wearing.

  The borehole 24 'has an outer diameter of 27.2 millimeters, an inner diameter of 23.4 millimeters, a length of 2 meters, a cleaning liquid discharge hole 137 having a hole diameter of 0.3 millimeters to 2 millimeters, and a width dimension. A water-absorbing hole 138 having a long hole in the direction along the axis L1 ′ of the test tube 24 ′ is formed with a long hole having a length of 0.3 to 2 mm and a length of 5 to 50 mm. Yes. As shown in FIG. 17, six purification liquid discharge holes 137 and six water absorption holes 138 are formed at equal angular intervals in the circumferential direction around the axis L1 ′. It is drilled by laser beam irradiation. The cleaning liquid discharge holes 137 and the water absorption holes 138 are alternately drilled in the direction of the axis L1 ′ of the test tube 24 ′, and when the cleaning tool 105 is disposed in the test tube 24 ′, the cleaning solution is cleaned. When the purification liquid is discharged from the purification liquid supply pipe 107 of the cleaning instrument 105, the purification liquid discharge holes 137 are positioned between the pair of expansion pipes 113, 114, and the groundwater is discharged from the purification liquid supply pipe 107 of the purification instrument 105. Are sucked between the pair of expansion tubes 113, 114.

Since the cleaning liquid discharge hole 137 is formed in a pore having a hole diameter of 0.3 millimeters to 2 millimeters, the cleaning tool 105 is disposed in the borehole 24 ′ and the cleaning liquid is supplied from the cleaning liquid supply pipe 107. When the cleaning liquid supply pump 132 supplies the cleaning liquid at a predetermined high pressure, the cleaning liquid urges around the borehole 24 ′ in the direction substantially perpendicular to the axis L 1 ′ of the borehole 24 ′ from the six cleaning liquid discharge holes 137. It is often injected into the ground. For this reason, as shown in FIG. 18, the purifying liquid diffuses in the ground in the substantially horizontal direction from the purifying liquid discharge holes 137... Of the borehole 24 '(the left and right side drilling pipes 24' in FIG. 18). The VOCs eluted from the soil by the purified liquid were disposed in the borehole 24 'together with the purified liquid and groundwater through the water intake hole 138 of another borehole 24' (the central borehole 24 'in FIG. 18). It is collected in the purification liquid supply pipe 107 of the purification instrument 105. This recovery removes underground VOCs and purifies the soil.
Further, since the water absorption holes 138 are formed as elongated holes having a width dimension of 0.3 millimeters to 2 millimeters and a length of 5 millimeters to 50 millimeters, when water is sucked from the water absorption holes 138, a large grain soil is formed. Since water cannot pass through the water absorption holes 138, only fine soil is recovered as muddy water, so that the water absorption holes 138 are not clogged with granular soil.

(Third embodiment)
Next, a third embodiment of the soil contamination investigation apparatus according to the present invention will be described in detail with reference to FIG. FIG. 19 is a block diagram showing a configuration of a soil contamination investigation apparatus according to the third embodiment. In this embodiment, a part of the equipment mounted on the work vehicle 1 described in the first embodiment is used. Further, in FIG. 19, the same or equivalent members as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Further, in FIG. 19, for the convenience of drawing, the ratios of the scales of the respective constituent members are shown different from each other.

In this embodiment, a plurality of boreholes 24... Penetrate into the ground of the contaminated area by the borehole operation described in the first embodiment, and the second borehole 24... Each of the purification instruments 105 described in the embodiment is disposed, and the purification liquid is supplied into the ground from the purification liquid supply pipe 107 of the purification instrument 105 of some of the plurality of test tubes 24. However, the supplied purification liquid is sucked together with the ground water from the purification liquid supply pipe 107 of the purification instrument 105 of the remaining boreholes 24, and the concentration of VOCs dissolved in the sucked liquid is measured. is there. In FIG. 19, for the convenience of drawing, the purification solution supply pipe 107 of the components of the purification instrument 105 disposed in the plurality of boreholes 24 penetrating into the hole of the ground E.. Only).
In FIG. 19, what is indicated by reference numerals X1 and X2 represents a contaminated area divided into two regions having a certain area, and these two regions are represented. Each end of the purification liquid supply connection pipe 126 connected to the purification liquid supply pipe 107 in the region X1 is connected to the water absorption pipe 141, and an opening / closing operation is performed in each middle part of the purification liquid supply connection pipe 126. The electromagnetic valves 142a, 142b, 142c, 142d, 142e for absorbing water are respectively disposed. The water absorbing electromagnetic valves 142a to 142e are connected to the controller 23 via electric wires (not shown), respectively, and are controlled to be opened and closed by the controller 23. The interior of each of the cleaning liquid supply pipe 107, the cleaning liquid supply connecting pipe 126, and the water absorption pipe 141 constitutes a water absorption passage in the present invention.

  The same water absorption means 50 as that of the first embodiment is connected to the end of the water absorption pipe 141. In this case, the water absorption pipe 141 is connected to the water absorption means 50 so as to correspond to the first connection pipe 44 in the first embodiment. Branch introduction pipes 143a, 143b, 143c, 143d, and 143e are respectively branched from the middle portion of the purification liquid supply connection pipe 126 between the purification liquid supply pipe 107 and the water absorption electromagnetic valves 142a to 142e, These branch introduction pipes 143a to 143e are connected to the collective introduction pipe 144, and branch introduction pipe electromagnetic valves 145a, 145b, 145c, 145d, and 145e are arranged in the middle of the branch introduction pipes 143a to 143e, respectively. It is installed. The branch introduction pipe solenoid valves 145 a to 145 e are connected to the controller 23 via electric wires (not shown), and are controlled to be opened and closed by the controller 23. The inside of the branch introduction pipes 143a to 143e constitutes a branch introduction passage referred to in the present invention, the inside of the collection introduction pipe 144 constitutes a collection introduction passage referred to in the present invention, and the electromagnetic valves 145a to 145e for branch introduction pipes The introduction control valve referred to in the present invention is configured.

  Further, each end portion of the purification liquid supply connection pipe 126 connected to the purification liquid supply pipe 107 in the region X2 is connected to the water absorption pipe 141, and in each middle part of the purification liquid supply connection pipe 126, Water-absorbing electromagnetic valves 142f, 142g, 142h, 142i, 142j that open and close are respectively provided. The water absorption electromagnetic valves 142f to 142j are connected to the controller 23 via electric wires (not shown), respectively, and are controlled to be opened and closed by the controller 23. Branching introduction pipes 143f, 143g, 143h, 143i, 143j are respectively branched from the middle part of the purification liquid supply connection pipe 126 ... between the purification liquid supply pipe 107 ... and the electromagnetic valves 142f to 142j for water absorption. These branch introduction pipes 143f to 143j are connected to the collective introduction pipe 144, and branch introduction pipe solenoid valves 145f, 145g, 145h, 145i, and 145j are arranged in the middle of the branch introduction pipes 143f to 143j, respectively. It is installed. The branch introduction pipe solenoid valves 145f to 145j are connected to the controller 23 via electric wires (not shown), respectively, and are controlled to be opened and closed by the controller 23. The insides of the branch introduction pipes 143f to 143j constitute a branch introduction passage referred to in the present invention, and the branch introduction pipe electromagnetic valves 145f to 145j constitute an introduction control valve referred to in the present invention.

  The collective introduction pipe 144 is connected to one end of the water introduction container 85, and a third water storage container 152 having a capacity approximately five times that of the water introduction container 85 is connected to the other end of the water introduction container 85 through the outlet pipe 86b. Connected. A derivation control valve 88 made up of an electromagnetic valve is disposed in the middle of the derivation pipe 86b. A sub-water absorption pump 153 is connected to the upper part of the third water storage container 152 via a fifth connection pipe 154, and a fifth connection pipe. A thirteenth electromagnetic valve 154 a is disposed in the middle of the 154. The auxiliary water absorption pump 153 constitutes the auxiliary water absorption means referred to in the present invention. In addition, the 14th electromagnetic valve 155a and the 15th electromagnetic valve 156a, which are both opened when discharging the water stored in the third water storage container 152, are provided at the upper part and the lower part of the third water storage container 152. The level of the stored water has reached either the predetermined upper limit or the lower limit in the third water storage container 152, which is disposed in the middle of the air introduction pipe 155 and the fourth drain pipe 156, respectively. And a third water level detection sensor 157 for transmitting the detection signal to the controller 23 via an electric wire (not shown). The thirteenth electromagnetic valve 154a, the fourteenth electromagnetic valve 155a, and the fifteenth electromagnetic valve 156a are connected to the controller 23 via electric wires (not shown), and are controlled to be opened and closed by the controller 23. The auxiliary water absorption pump 153 is connected to the controller 23 via an electric wire (not shown), and the controller 23 controls the operation or the stop of the operation.

(Soil contamination investigation work process)
When investigating soil contamination using the soil contamination investigation device described above, the following work process is used. In addition, although the control of the operation of the solenoid valve and the pump in the following work process is all performed by the controller 23, the operation may be performed artificially as described in the first and second embodiments. Good.

  (1) First, when collecting groundwater from a point in the region X1, only the water absorption electromagnetic valve 142a is closed among the water absorption electromagnetic valves 142a to 142e that have been opened for water absorption by the water absorption means 50, for example. At the same time, the branch introduction pipe solenoid valve 145a among the branch introduction pipe solenoid valves 145a to 145e that has been closed is opened. At the same time, the derivation control valve 88 and the thirteenth electromagnetic valve 154a are opened and the auxiliary water suction pump 153 is operated. At this time, all the water absorption electromagnetic valves 142f to 142j in the region X2 are opened for water absorption by the water absorption means 50, and the branch introduction pipe electromagnetic valves 145f to 145j are closed. Groundwater sucked from the purification liquid supply pipe 107 corresponding to the water absorption electromagnetic valve 142a is introduced into the water introduction container 85 via the branch introduction pipe 143a and the collective introduction pipe 144. This state is performed for a certain time. At this time, both the ninth electromagnetic valve 93a and the tenth electromagnetic valve 94a are closed, and the water supply pump 96 is also stopped.

  (2) The sub-water absorption pump 153 is stopped in a state where the predetermined time has elapsed and the water introduction container 85 is filled with water, passes through the outlet pipe 86b, and flows into the third water storage container 152. At the same time, both the branch introduction pipe electromagnetic valve 145a and the derivation control valve 88 are closed. At the same time, the water absorption electromagnetic valve 142a is opened, and the groundwater is again sucked by the water absorption means 50 from the purified liquid supply pipe 107 corresponding to the water absorption electromagnetic valve 142a. On the other hand, the branch introduction pipes 143a to 143j, the collective introduction pipe 144, the water introduction container 85, and the outlet pipe 86b between the branch introduction pipe solenoid valves 145a to 145j and the derivation control valve 88 are filled with water. And the branch introduction pipe electromagnetic valve 145a and the outlet control valve 88 are hermetically sealed.

The work processes (3) to (6) are the same as the work processes (3) to (6) of the soil contamination investigation described in the first embodiment. Therefore, the description is omitted.
(7) Next, among the water-absorbing electromagnetic valves 142a to 142e that have been opened, only the water-absorbing electromagnetic valve 142b is closed, and among the electromagnetic valves 145a to 145e that have been closed, The branch introduction pipe electromagnetic valve 145b is opened. At the same time, the derivation control valve 88 and the thirteenth electromagnetic valve 154a are opened and the auxiliary water suction pump 153 is operated. At this time, all the water absorption electromagnetic valves 142f to 142j in the region X2 are opened for water absorption by the water absorption means 50, and the branch introduction pipe electromagnetic valves 145f to 145j are closed. The groundwater sucked from the purification liquid supply pipe 107 corresponding to the water absorption electromagnetic valve 142b is introduced into the water introduction container 85 through the branch introduction pipe 143b and the collective introduction pipe 144. This state is performed for a certain time. At this time, both the ninth electromagnetic valve 93a and the tenth electromagnetic valve 94a are closed, and the water supply pump 96 is also stopped.

  (8) The sub-water absorption pump 153 is stopped in a state where the predetermined time has elapsed and the water introduction container 85 is filled with water, passes through the outlet pipe 86b, and flows into the third water storage container 152. At the same time, both the branch introduction pipe solenoid valve 145b and the derivation control valve 88 are closed. At the same time, the water absorption electromagnetic valve 142b is opened, and the ground water is again sucked by the water absorption means 50 from the purified liquid supply pipe 107 corresponding to the water absorption electromagnetic valve 142b. On the other hand, the branch introduction pipes 143a to 143j, the collective introduction pipe 144, the water introduction container 85, and the outlet pipe 86b between the branch introduction pipe solenoid valves 145a to 145j and the derivation control valve 88 are filled with water. And the branch introduction pipe electromagnetic valve 145a and the outlet control valve 88 are hermetically sealed.

The work steps (9) to (12) are the same as the work steps (3) to (6) of the soil contamination investigation described in the first embodiment. Therefore, the description is omitted.
(13) Hereinafter, similarly, only one of the next water-absorbing solenoid valves is closed, and only one of the branch introduction pipe solenoid valves corresponding to the water-absorbing solenoid valve is opened. The water intake solenoid valve and the branch introduction pipe solenoid valve are sequentially controlled to be opened and closed. Thereafter, the water introduction container 85 is filled with water, the VOCs are vaporized in the vaporization container 92, and the VOCs are measured by the concentration measuring device 104. Concentration measurement is performed. In this way, after the soil contamination survey in the region X1 is completed, the soil contamination survey in the region X2 is similarly performed.
When the soil contamination investigation in the area X2 is completed, the process returns to the area X1 again, and among the water-absorbing electromagnetic valves 142a to 142e that have been opened, only the water-absorbing electromagnetic valve 142a is closed and closed. Of the branch introduction pipe solenoid valves 145a to 145e, the branch introduction pipe solenoid valve 145a is opened. After that, filling of water into the water introduction container 85, vaporization of VOCs in the vaporization container 92, measurement of the concentration of VOCs by the concentration measuring device 104, and the like are performed.

  When the third water level detection sensor 157 detects that the water level stored in the third water storage container 152 has reached the predetermined upper limit level in the work process described above, the fourteenth electromagnetic valve 155a and Both the fifteenth electromagnetic valves 156a are opened, air is introduced from the third air introduction pipe 155, and the water in the third water storage container 152 is discharged by free fall. This discharge is performed when the operation of the auxiliary water suction pump 153 is stopped. When the third water level detection sensor 157 detects that the water level in the third water storage container 152 has reached a predetermined lower limit water level, both the fourteenth electromagnetic valve 155a and the fifteenth electromagnetic valve 156a are closed. .

  According to the soil contamination survey sampling device configured as described above, water is sucked by the auxiliary water suction pump 153 via the outlet pipe 86b, so that water is quickly introduced into the water introduction container 85. be able to.

  In addition, according to the soil contamination investigation sample collecting apparatus configured as described above, the purification liquid supply pipes 107 are respectively arranged in the plurality of holes drilled in the ground, and these purification liquid supply pipes 107. Are connected to the water introduction container 85 via the purification liquid supply connecting pipe 126, the branch introduction pipes 143a to 143j and the collective introduction pipe 144, and the branch introduction pipe electromagnetic valves 145a to 143a are connected to the branch introduction pipes 143a to 143j, respectively. 145j is arranged, so that each of the branch introduction pipe solenoid valves 145a to 145j is opened one by one and the branch introduction pipe solenoid valve other than the opened branch introduction pipe solenoid valve is closed. It is easy to individually collect underground water at each point where the cleaning liquid supply pipes 107 are disposed. For this reason, by individually measuring the concentration of VOCs contained in individually collected water, it is possible to easily individually investigate soil contamination at each point where the purification solution supply pipes 107 are disposed.

In this embodiment as well, structural changes equivalent to those in the first and second embodiments are the same as those in the first and second embodiments described above. Needless to say, the same functions and effects as those of the first and second embodiments can be obtained.
Further, in the above-described embodiment, the example in which the water-absorbing electromagnetic valves 142a to 142j are respectively disposed in the purified liquid supply connecting pipes 126 connected to the water-absorbing pipe 141 has been shown. If the sub-water absorption pump 153 has sufficient output without being constrained by the configuration, and water can be introduced into the water introduction container 85 by suction of the sub-water absorption pump 153, the water absorption electromagnetic valves 142a to 142j should be abolished. The cleaning liquid supply connection pipes 126 may be directly connected to the water absorption pipe 141.

  Further, in this embodiment, the water flowing out from the outlet pipe 86b is sucked by the auxiliary water suction pump 153 and stored in the third water storage container 152. However, the present invention is not limited to such a configuration. As shown in the block diagram of FIG. 20 with a part of FIG. 19 changed, the outlet pipe 86b is directly connected to the water absorption pipe 141, and the water flowing out from the outlet pipe 86b is sucked by the water absorption means 50. You can also. In this way, the third water storage container 152, the sub-water absorption pump 153, and the like can be omitted, so that the soil contamination investigation sample collection device can be provided at a low cost.

  In this embodiment, the contaminated area is divided into two regions X1 and X2, and a plurality of bores 24 are penetrated into each of these two regions. Without being constrained by such a configuration, the contaminated area is further divided into a plurality of regions, and a plurality of boreholes 24 are inserted into all of the regions, and the boreholes 24 are respectively disposed. You may make it measure the density | concentration of VOCs which attracted | sucks from the purification liquid supply pipe | tube 107 of the purification instrument 105, and is melt | dissolving in the sucked ground water.

  Moreover, in this embodiment, while supplying the purification liquid into the ground from the purification liquid supply pipe 107 of the purification instrument 105 of some of the plurality of boreholes 24. The liquid is sucked together with the groundwater from the purifying liquid supply pipe 107 of the purifying apparatus 105 of the remaining boreholes 24, and the concentration of VOCs dissolved in the sucked liquid is measured. Without being constrained by such a configuration, the concentration of VOCs dissolved in the aspirated groundwater is measured by simply aspirating the groundwater from the purifying fluid supply pipe 107 without supplying the purifying fluid to the ground. The degree of soil contamination in the ground may be investigated.

FIG. 1 is a side view showing a configuration of a work vehicle equipped with a soil contamination investigation device according to the present invention. FIG. 2 is a plan view showing a state in which a work vehicle equipped with the soil contamination investigation device according to the present invention is viewed from above. FIG. 3 is a cross-sectional view showing a state where the excavation member is fixed to the tip of the borehole. 4A is an enlarged cross-sectional view taken along the line AA in FIG. 3, FIG. 4B is an enlarged cross-sectional view taken along the line BB in FIG. 3, and FIG. FIG. 3 is an enlarged view showing the appearance of the excavation member viewed from the tip side. FIG. 5 is a block diagram showing the configuration of the soil contamination investigation device according to the present invention. FIG. 6 is a block diagram showing the configuration of the soil contamination investigation device main body of the soil contamination investigation device according to the present invention. FIG. 7 is a view showing a configuration of a closing member fixed to the rear end portion of the borehole. FIG. 8 is a diagram showing a configuration of a three-way joint connected to the water supply pipe and the water absorption pipe. FIG. 9 is a cross-sectional view showing the configuration of the cleaning liquid discharge hole formed in the borehole. FIG. 10 is a view showing the appearance of a frame body on which a water supply pipe, a water absorption pipe, and a borehole are placed as viewed from the front. FIG. 11 is a diagram showing an external appearance of the frame on which the water supply pipe, the water absorption pipe, and the borehole are placed as viewed from the left side. FIG. 12 is a diagram showing a purification instrument according to the second embodiment of the present invention with a part thereof broken. FIG. 13 is a diagram schematically showing a state in which the soil contamination investigation device according to the second embodiment of the present invention is used. FIG. 14 is a cross-sectional view showing a state in which a purification instrument according to the second embodiment of the present invention is installed in a borehole. FIG. 15 is a view showing a state in which soil contamination is being purified by a borehole in which a purification device according to a second embodiment of the present invention is installed and penetrated into the ground. FIG. 16 is a cross-sectional view showing a part of the tip side of another borehole according to the second embodiment of the present invention. FIG. 17 is an enlarged cross-sectional view taken along line C1-C1 and line C2-C2 in FIG. FIG. 18 is a view showing a state in which soil contamination is being purified by a test tube installed with a purification device according to the second embodiment of the present invention and penetrating into the ground. FIG. 19 is a block diagram showing a configuration of a soil contamination investigation apparatus according to the third embodiment of the present invention. FIG. 20 is a block diagram in which a part of the configuration of FIG. 19 is changed.

Explanation of symbols

9 Soil Contamination Survey Device 23 Controller (Control Device)
50 Water absorption means 85 Water introduction container (water introduction chamber)
86a Introduction pipe (introduction passage)
86b Lead pipe (lead passage)
87 Introduction control valve 88 Derivation control valve 91 On-off valve 92 Vaporization container (vaporization chamber)
93a Ninth solenoid valve (water supply means)
94a 10th solenoid valve (water supply means)
96 Water supply pump (water supply means)
101 Air circulation pipe (air circulation passage)
102 Air supply pump (air supply means)
103 Circulation return pipe for measurement (circulation passage for measurement)
104 Concentration measuring device (measuring means)
109 Circulation return pipe (measurement circulation passage)
143a Branch introduction pipe (branch introduction passage)
143b Branch introduction pipe (branch introduction passage)
143c Branch introduction pipe (branch introduction passage)
143d Branch introduction pipe (branch introduction passage)
143e Branch introduction pipe (branch introduction passage)
143f Branch introduction pipe (branch introduction passage)
143g Branch introduction pipe (branch introduction passage)
143h Branch introduction pipe (branch introduction passage)
143i Branch introduction pipe (branch introduction passage)
143j Branch introduction pipe (branch introduction passage)
144 Collective introduction pipe (collective introduction passage)
145a Solenoid valve for branch introduction pipe (introduction control valve)
145b Solenoid valve for branch introduction pipe (introduction control valve)
145c Solenoid valve for branch introduction pipe (introduction control valve)
145d Solenoid valve for branch introduction pipe (introduction control valve)
145e Solenoid valve for branch introduction pipe (introduction control valve)
145f Solenoid valve for branch introduction pipe (introduction control valve)
145g Solenoid valve for branch introduction pipe (introduction control valve)
145h Solenoid valve for branch introduction pipe (introduction control valve)
145i Solenoid valve for branch introduction pipe (introduction control valve)
145j Solenoid valve for branch introduction pipe (introduction control valve)
153 Sub-water absorption pump (sub-water absorption means)
E Ground

Claims (9)

A water absorption passage in which a tip side is disposed inside a hole made in the ground;
Water absorption means for sucking water through the water absorption passage;
An introduction passage branched from the middle of the water absorption passage and communicating with the water introduction chamber;
Water introduction means for introducing water flowing through the water absorption passage into the water introduction chamber;
A lead-out passage communicating with the water introduction chamber and discharging water introduced into the water introduction chamber through the introduction passage to the outside of the water introduction chamber;
An introduction control valve disposed in the introduction passage and allowing or prohibiting passage of water in the introduction passage;
A sampling device for soil contamination investigation, comprising a derivation control valve disposed in the derivation passage and allowing or prohibiting passage of water in the derivation passage;
When the introduction control valve prohibits passage of water in the introduction passage and the introduction control valve prohibits passage of water in the lead-out passage, the introduction control valve and the discharge control valve are viewed from the path of water flow. A sampling device for soil contamination investigation, wherein the introduction passage, the water introduction chamber, and the lead-out passage located between the two are sealed by the introduction control valve and the lead-out control valve. In the sampling device for soil contamination survey according to claim 1,
The water introduced into the water introduction chamber by merging the outlet passage with the water absorption passage is returned to the water absorption passage again through the outlet passage,
The water introduction means is disposed at a portion of the water absorption passage between a portion where the introduction passage branches from the water absorption passage and a portion where the outlet passage merges with the water absorption passage, and the passage of water flowing through the portion of the water absorption passage Sampling device for soil contamination survey, which consists of on-off valve that allows or restricts. In the sampling device for soil contamination survey according to claim 1,
A soil sampling device for sampling a soil contamination, wherein the water introduction means is constituted by sub-water absorption means that is connected to the outlet passage and sucks water flowing through the outlet passage. In the sample collection device for soil contamination investigation according to any one of claims 1 to 3,
The front end side of the water absorption passage is constituted by a branched water absorption passage in which the front end side is disposed in each of a plurality of holes bored in the ground,
The introduction passage is constituted by a branch introduction passage that branches from the branch water intake passage and a collective introduction passage that joins these branch introduction passages and communicates with the water introduction chamber,
A sampling device for soil contamination investigation, wherein the introduction control valve is disposed in each branch introduction passage. A sample collection device for soil contamination investigation according to any one of claims 1 to 4,
Vaporization means for vaporizing the investigation target substance dissolved in the water stored in the water introduction chamber;
A soil contamination investigation device comprising: a measurement means for measuring the concentration of the investigation target substance vaporized by the vaporization means. In the soil contamination investigation device according to claim 5,
The vaporization means includes a vaporization chamber and air supply means for supplying air to the vaporization chamber,
By transferring the water stored in the water introduction chamber to the vaporization chamber and supplying the air to the vaporization chamber by the air supply means, the investigation target substance contained in the water transferred to the vaporization chamber is transferred to the vaporization chamber. Vaporized and mixed with the air in the vaporizing chamber to produce mixed air,
A soil contamination investigation device configured to measure the concentration of the investigation target substance contained in the mixed air by the measurement means. In the soil contamination investigation device according to claim 6,
One end of the air circulation passage is communicated with the upper part of the vaporization chamber and the other end of the air circulation passage is communicated with the lower part of the vaporization chamber,
Arranging the air supply means in the middle of the air circulation passage;
The air accumulated in the upper part of the vaporization chamber is sucked by the air supply means from one end of the air circulation passage, and the sucked air is supplied again from the other end of the air circulation passage to the water stored in the lower portion of the vaporization chamber. By doing so, the investigation target substance contained in the water transferred to the vaporization chamber is vaporized in the vaporization chamber and mixed with the air in the vaporization chamber to generate mixed air,
A soil contamination investigation device configured to measure the concentration of the investigation target substance contained in the mixed air by the measurement means. In the soil contamination investigation device according to claim 6 or 7,
The measurement means is arranged in the middle of the measurement circulation path while communicating one end and the other end of the measurement circulation path to the upper part of the vaporization chamber,
The measurement unit measures the concentration of the substance to be investigated contained in the mixed air while circulating the mixed air accumulated in the upper part of the vaporization chamber through the measurement circulation passage and passing through the measurement unit. Soil contamination survey device. In the soil contamination investigation device according to any one of claims 6 to 8,
Water supply means for transferring water from the water introduction chamber to the vaporization chamber;
A soil contamination investigation device comprising: a control device that controls the operation of each of the water supply means, the introduction control valve, the derivation control valve, and the air supply means and that outputs a data signal of a measurement value measured by the measurement means .

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